TY  - JOUR
AU  - Lazarov, Nenad Đ.
AU  - Forgiarini, Ivan
PY  - 2024
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12240
AB  - In our work we presented the modified field equations generated by action of Weyl conformal gravity. Assuming static cylindric symmetry, we derived the corresponding Bach tensor and from field equation we find gravity potential. We solved geodesic equations in the case of conformal gravity potential. Also we consider precession perihelion of Solar planets and S stars.
T2  - Filomat
T1  - Geodesic equations of Weyl conformal gravity theory in CSS metric
VL  - 38
IS  - 4
SP  - 1451
EP  - 1464
DO  - 10.2298/FIL2404451L
ER  - 

@article{
author = "Lazarov, Nenad Đ. and Forgiarini, Ivan",
year = "2024",
abstract = "In our work we presented the modified field equations generated by action of Weyl conformal gravity. Assuming static cylindric symmetry, we derived the corresponding Bach tensor and from field equation we find gravity potential. We solved geodesic equations in the case of conformal gravity potential. Also we consider precession perihelion of Solar planets and S stars.",
journal = "Filomat",
title = "Geodesic equations of Weyl conformal gravity theory in CSS metric",
volume = "38",
number = "4",
pages = "1451-1464",
doi = "10.2298/FIL2404451L"
}

Lazarov, N. Đ.,& Forgiarini, I.. (2024). Geodesic equations of Weyl conformal gravity theory in CSS metric. in Filomat, 38(4), 1451-1464.
https://doi.org/10.2298/FIL2404451L

Lazarov NĐ, Forgiarini I. Geodesic equations of Weyl conformal gravity theory in CSS metric. in Filomat. 2024;38(4):1451-1464.
doi:10.2298/FIL2404451L .

Lazarov, Nenad Đ., Forgiarini, Ivan, "Geodesic equations of Weyl conformal gravity theory in CSS metric" in Filomat, 38, no. 4 (2024):1451-1464,
https://doi.org/10.2298/FIL2404451L . .

TY  - JOUR
AU  - Čevizović, Dalibor
AU  - Lazarov, Nenad Đ.
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11238
AB  - За таласе знамо од памтивека. Таласи су највероватније први пут примећени на површини воде. Солитони су примећени тек у 19. веку. Од тада је ова врста таласног кретања препозната на потпуно неочекиваним местима: од бескрајних пространстава универзума до молекуларног нивоа, чак и дубље, у структури самог простора и елементарних честица! У овом раду представићемо пример КдВ солитонских таласа тј. решење њене диференцијалне једначине.
T2  - Nastava fizike
T1  - Солитони или цунами таласи
IS  - 12
SP  - 103
EP  - 108
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11238
ER  - 

@article{
author = "Čevizović, Dalibor and Lazarov, Nenad Đ.",
year = "2023",
abstract = "За таласе знамо од памтивека. Таласи су највероватније први пут примећени на површини воде. Солитони су примећени тек у 19. веку. Од тада је ова врста таласног кретања препозната на потпуно неочекиваним местима: од бескрајних пространстава универзума до молекуларног нивоа, чак и дубље, у структури самог простора и елементарних честица! У овом раду представићемо пример КдВ солитонских таласа тј. решење њене диференцијалне једначине.",
journal = "Nastava fizike",
title = "Солитони или цунами таласи",
number = "12",
pages = "103-108",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11238"
}

Čevizović, D.,& Lazarov, N. Đ.. (2023). Солитони или цунами таласи. in Nastava fizike(12), 103-108.
https://hdl.handle.net/21.15107/rcub_vinar_11238

Čevizović D, Lazarov NĐ. Солитони или цунами таласи. in Nastava fizike. 2023;(12):103-108.
https://hdl.handle.net/21.15107/rcub_vinar_11238 .

Čevizović, Dalibor, Lazarov, Nenad Đ., "Солитони или цунами таласи" in Nastava fizike, no. 12 (2023):103-108,
https://hdl.handle.net/21.15107/rcub_vinar_11238 .

TY  - JOUR
AU  - Lazarov, Nenad Đ.
AU  - Borka Jovanović, Vesna
AU  - Borka, Duško
AU  - Jovanović, Predrag
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11234
AB  - In our work we presented the modified field equations generated by action with unspecified function f (R). Assuming spherical symmetry, we used the corresponding static Schwarzschild-like metric in the weak field limit. Also we considered geodesic equations of motion describing orbits and orbital speeds which can be measured in galactic environment. We solved geodesic equations in the case of a power-law f (R) theories, that is we set f (R) = f0nRn.
T2  - Filomat
T1  - Geodesic equations in the weak field limit of general f (R) gravity theory
VL  - 37
IS  - 25
SP  - 8575
EP  - 8581
DO  - 10.2298/FIL2325575L
ER  - 

@article{
author = "Lazarov, Nenad Đ. and Borka Jovanović, Vesna and Borka, Duško and Jovanović, Predrag",
year = "2023",
abstract = "In our work we presented the modified field equations generated by action with unspecified function f (R). Assuming spherical symmetry, we used the corresponding static Schwarzschild-like metric in the weak field limit. Also we considered geodesic equations of motion describing orbits and orbital speeds which can be measured in galactic environment. We solved geodesic equations in the case of a power-law f (R) theories, that is we set f (R) = f0nRn.",
journal = "Filomat",
title = "Geodesic equations in the weak field limit of general f (R) gravity theory",
volume = "37",
number = "25",
pages = "8575-8581",
doi = "10.2298/FIL2325575L"
}

Lazarov, N. Đ., Borka Jovanović, V., Borka, D.,& Jovanović, P.. (2023). Geodesic equations in the weak field limit of general f (R) gravity theory. in Filomat, 37(25), 8575-8581.
https://doi.org/10.2298/FIL2325575L

Lazarov NĐ, Borka Jovanović V, Borka D, Jovanović P. Geodesic equations in the weak field limit of general f (R) gravity theory. in Filomat. 2023;37(25):8575-8581.
doi:10.2298/FIL2325575L .

Lazarov, Nenad Đ., Borka Jovanović, Vesna, Borka, Duško, Jovanović, Predrag, "Geodesic equations in the weak field limit of general f (R) gravity theory" in Filomat, 37, no. 25 (2023):8575-8581,
https://doi.org/10.2298/FIL2325575L . .

TY  - JOUR
AU  - Cucić, Dragoljub
AU  - Lazarov, Nenad Đ.
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11239
AB  - Ова, 2023. година, је година у којој се навршава 100 година од како је први пут објављена књига Михајла Пупина, From Immigrant to Inventor. Значај књиге потврђен је већ после година доана када ј у категорији биографија и аутобиографија добила Пулицерову награду. Књига се и данас, после 100 година, чита и објављује. Актуелна и саветодавна. У раду је представљено како је она настала, као и шта јој је претходило.
T2  - Nastava fizike
T1  - 100 година од објављивања књиге From Immigrant to Inventor Михајла Пупина
IS  - 12
SP  - 221
EP  - 227
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11239
ER  - 

@article{
author = "Cucić, Dragoljub and Lazarov, Nenad Đ.",
year = "2023",
abstract = "Ова, 2023. година, је година у којој се навршава 100 година од како је први пут објављена књига Михајла Пупина, From Immigrant to Inventor. Значај књиге потврђен је већ после година доана када ј у категорији биографија и аутобиографија добила Пулицерову награду. Књига се и данас, после 100 година, чита и објављује. Актуелна и саветодавна. У раду је представљено како је она настала, као и шта јој је претходило.",
journal = "Nastava fizike",
title = "100 година од објављивања књиге From Immigrant to Inventor Михајла Пупина",
number = "12",
pages = "221-227",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11239"
}

Cucić, D.,& Lazarov, N. Đ.. (2023). 100 година од објављивања књиге From Immigrant to Inventor Михајла Пупина. in Nastava fizike(12), 221-227.
https://hdl.handle.net/21.15107/rcub_vinar_11239

Cucić D, Lazarov NĐ. 100 година од објављивања књиге From Immigrant to Inventor Михајла Пупина. in Nastava fizike. 2023;(12):221-227.
https://hdl.handle.net/21.15107/rcub_vinar_11239 .

Cucić, Dragoljub, Lazarov, Nenad Đ., "100 година од објављивања књиге From Immigrant to Inventor Михајла Пупина" in Nastava fizike, no. 12 (2023):221-227,
https://hdl.handle.net/21.15107/rcub_vinar_11239 .

TY  - CONF
AU  - Cucić, Dragoljub A.
AU  - Janković, Ljiljana
AU  - Lazarov, Nenad
AU  - Radovanović, Vladimir
AU  - Zečević, Danilo
AU  - Cvijetić, Dušan
AU  - Cucić, Aleksandar
AU  - Žarkov, Borislav
AU  - Stanoevski, Vera
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11936
AB  - Since the very beginning, Regional Center for Talents “Mihajlo Pupin” in Pančevo had a physics group. Over time, the number of classes has grown, but so did the number of students and mentors. Consequently, the achievements on national and even international competitions in physics were growing steadily. After first few years spent in experimenting different possibilities in the field of work with talented students in physics, the standard of classes has been established. Such standard, with the help of motivated students and mentors has produced a successful mechanism for preparing students for various challenges in the field of physics and beyond. This paper presents a model of working in the physics group in Regional Center for Talents “Mihajlo Pupin” in Pančevo, as well as the results our students have achieved on national and international physics and science competitions in the last 15 years of work.
C3  - Proceedings of Science
T1  - Work with motivated and gifted students in physics in RCT “Mihajlo Pupin” from Pančevo - a review of the last 15 years
VL  - 427
SP  - 193246
DO  - 10.22323/1.427.0276
ER  - 

@conference{
author = "Cucić, Dragoljub A. and Janković, Ljiljana and Lazarov, Nenad and Radovanović, Vladimir and Zečević, Danilo and Cvijetić, Dušan and Cucić, Aleksandar and Žarkov, Borislav and Stanoevski, Vera",
year = "2023",
abstract = "Since the very beginning, Regional Center for Talents “Mihajlo Pupin” in Pančevo had a physics group. Over time, the number of classes has grown, but so did the number of students and mentors. Consequently, the achievements on national and even international competitions in physics were growing steadily. After first few years spent in experimenting different possibilities in the field of work with talented students in physics, the standard of classes has been established. Such standard, with the help of motivated students and mentors has produced a successful mechanism for preparing students for various challenges in the field of physics and beyond. This paper presents a model of working in the physics group in Regional Center for Talents “Mihajlo Pupin” in Pančevo, as well as the results our students have achieved on national and international physics and science competitions in the last 15 years of work.",
journal = "Proceedings of Science",
title = "Work with motivated and gifted students in physics in RCT “Mihajlo Pupin” from Pančevo - a review of the last 15 years",
volume = "427",
pages = "193246",
doi = "10.22323/1.427.0276"
}

Cucić, D. A., Janković, L., Lazarov, N., Radovanović, V., Zečević, D., Cvijetić, D., Cucić, A., Žarkov, B.,& Stanoevski, V.. (2023). Work with motivated and gifted students in physics in RCT “Mihajlo Pupin” from Pančevo - a review of the last 15 years. in Proceedings of Science, 427, 193246.
https://doi.org/10.22323/1.427.0276

Cucić DA, Janković L, Lazarov N, Radovanović V, Zečević D, Cvijetić D, Cucić A, Žarkov B, Stanoevski V. Work with motivated and gifted students in physics in RCT “Mihajlo Pupin” from Pančevo - a review of the last 15 years. in Proceedings of Science. 2023;427:193246.
doi:10.22323/1.427.0276 .

Cucić, Dragoljub A., Janković, Ljiljana, Lazarov, Nenad, Radovanović, Vladimir, Zečević, Danilo, Cvijetić, Dušan, Cucić, Aleksandar, Žarkov, Borislav, Stanoevski, Vera, "Work with motivated and gifted students in physics in RCT “Mihajlo Pupin” from Pančevo - a review of the last 15 years" in Proceedings of Science, 427 (2023):193246,
https://doi.org/10.22323/1.427.0276 . .

TY  - JOUR
AU  - Лазаров, Ненад Ђ.
AU  - Цуцић, Драгољуб А.
AU  - Тепшић, Илија
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12481
AB  - Михајло Пупин је један од првих 15 чланова Њујоршког математичког друштва, из којег је 1894. године настало Америчко математичко друштво. Пупин је био образован математичар, што је у време његове младости, у Америци била реткост. Математику је примењивао у физици и електротехници, које су биле његова главна поља делатности. У раду ће бити представљено како се школовао и која су била његова постигнућа и активности у оба математичка друштва чији је био члан. Представљен је део његове дисертације, из 1889. године, који је и најранији писани документ у коме се препознаје његово познавање математике. Михајло Пупин је прва особа која је одржала предавање у част Џосаје Виларда Гибса у организацији Америчкоg математичкоg друштвa, фебруара 1924. године.
T2  - Phlogiston
T1  - Михајло Пупин и математика
IS  - 31
SP  - 61
EP  - 95
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12481
ER  - 

@article{
author = "Лазаров, Ненад Ђ. and Цуцић, Драгољуб А. and Тепшић, Илија",
year = "2023",
abstract = "Михајло Пупин је један од првих 15 чланова Њујоршког математичког друштва, из којег је 1894. године настало Америчко математичко друштво. Пупин је био образован математичар, што је у време његове младости, у Америци била реткост. Математику је примењивао у физици и електротехници, које су биле његова главна поља делатности. У раду ће бити представљено како се школовао и која су била његова постигнућа и активности у оба математичка друштва чији је био члан. Представљен је део његове дисертације, из 1889. године, који је и најранији писани документ у коме се препознаје његово познавање математике. Михајло Пупин је прва особа која је одржала предавање у част Џосаје Виларда Гибса у организацији Америчкоg математичкоg друштвa, фебруара 1924. године.",
journal = "Phlogiston",
title = "Михајло Пупин и математика",
number = "31",
pages = "61-95",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12481"
}

Лазаров, Н. Ђ., Цуцић, Д. А.,& Тепшић, И.. (2023). Михајло Пупин и математика. in Phlogiston(31), 61-95.
https://hdl.handle.net/21.15107/rcub_vinar_12481

Лазаров НЂ, Цуцић ДА, Тепшић И. Михајло Пупин и математика. in Phlogiston. 2023;(31):61-95.
https://hdl.handle.net/21.15107/rcub_vinar_12481 .

Лазаров, Ненад Ђ., Цуцић, Драгољуб А., Тепшић, Илија, "Михајло Пупин и математика" in Phlogiston, no. 31 (2023):61-95,
https://hdl.handle.net/21.15107/rcub_vinar_12481 .

TY  - JOUR
AU  - Borka, Duško
AU  - Borka Jovanović, Vesna
AU  - Nikolić, Violeta N.
AU  - Lazarov, Nenad Đ.
AU  - Jovanović, Predrag
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10151
AB  - We estimate the parameters of the Hybrid Palatini gravity model with the Schwarzschild precession of S-stars, specifically of the S2, S38 and S55 stars. We also take into account the case of bulk mass distribution near the Galactic Center. We assume that the Schwarzschild orbital precession of mentioned S-stars is the same as in General Relativity (GR) in all studied cases. In 2020, the GRAVITY Collaboration detected the orbital precession of the S2 star around the supermassive black hole (SMBH) at the Galactic Center and showed that it is close to the GR prediction. The astronomical data analysis of S38 and S55 orbits showed that, also in these cases, the orbital precession is close to the GR prediction. Based on this observational fact, we evaluated the parameters of the Hybrid Palatini Gravity model with the Schwarzschild precession of the S2, S38 and S55 stars, and we estimated the range of parameters of the Hybrid Palatini gravity model for which the orbital precession is as in GR for all three stars. We also evaluated the parameters of the Hybrid Palatini Gravity model in the case of different values of bulk mass density distribution of extended matter. We believe that proposed method is a useful tool to evaluate parameters of the gravitational potential at the Galactic Center. © 2022 by the authors. Licensee MDPI, Basel, Switzerland.
T2  - Universe
T1  - Estimating the Parameters of the Hybrid Palatini Gravity Model with the Schwarzschild Precession of S2, S38 and S55 Stars: Case of Bulk Mass Distribution
VL  - 8
IS  - 2
SP  - 70
DO  - 10.3390/universe8020070
ER  - 

@article{
author = "Borka, Duško and Borka Jovanović, Vesna and Nikolić, Violeta N. and Lazarov, Nenad Đ. and Jovanović, Predrag",
year = "2022",
abstract = "We estimate the parameters of the Hybrid Palatini gravity model with the Schwarzschild precession of S-stars, specifically of the S2, S38 and S55 stars. We also take into account the case of bulk mass distribution near the Galactic Center. We assume that the Schwarzschild orbital precession of mentioned S-stars is the same as in General Relativity (GR) in all studied cases. In 2020, the GRAVITY Collaboration detected the orbital precession of the S2 star around the supermassive black hole (SMBH) at the Galactic Center and showed that it is close to the GR prediction. The astronomical data analysis of S38 and S55 orbits showed that, also in these cases, the orbital precession is close to the GR prediction. Based on this observational fact, we evaluated the parameters of the Hybrid Palatini Gravity model with the Schwarzschild precession of the S2, S38 and S55 stars, and we estimated the range of parameters of the Hybrid Palatini gravity model for which the orbital precession is as in GR for all three stars. We also evaluated the parameters of the Hybrid Palatini Gravity model in the case of different values of bulk mass density distribution of extended matter. We believe that proposed method is a useful tool to evaluate parameters of the gravitational potential at the Galactic Center. © 2022 by the authors. Licensee MDPI, Basel, Switzerland.",
journal = "Universe",
title = "Estimating the Parameters of the Hybrid Palatini Gravity Model with the Schwarzschild Precession of S2, S38 and S55 Stars: Case of Bulk Mass Distribution",
volume = "8",
number = "2",
pages = "70",
doi = "10.3390/universe8020070"
}

Borka, D., Borka Jovanović, V., Nikolić, V. N., Lazarov, N. Đ.,& Jovanović, P.. (2022). Estimating the Parameters of the Hybrid Palatini Gravity Model with the Schwarzschild Precession of S2, S38 and S55 Stars: Case of Bulk Mass Distribution. in Universe, 8(2), 70.
https://doi.org/10.3390/universe8020070

Borka D, Borka Jovanović V, Nikolić VN, Lazarov NĐ, Jovanović P. Estimating the Parameters of the Hybrid Palatini Gravity Model with the Schwarzschild Precession of S2, S38 and S55 Stars: Case of Bulk Mass Distribution. in Universe. 2022;8(2):70.
doi:10.3390/universe8020070 .

Borka, Duško, Borka Jovanović, Vesna, Nikolić, Violeta N., Lazarov, Nenad Đ., Jovanović, Predrag, "Estimating the Parameters of the Hybrid Palatini Gravity Model with the Schwarzschild Precession of S2, S38 and S55 Stars: Case of Bulk Mass Distribution" in Universe, 8, no. 2 (2022):70,
https://doi.org/10.3390/universe8020070 . .

TY  - JOUR
AU  - Nikolić, Violeta N.
AU  - Rajnak, Michal
AU  - Mariano, Jose F. M. L.
AU  - Lazarov, Nenad Đ.
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10199
AB  - The characterization of nanocomposite samples which contain Cu, Fe-species, prepared by the sol-gel method, was established by Nikolić et al., in a previous article (Nikolić et al. in Journal of Solid State Physics 513:1, 2021). In this study, the magnetic behavior of nanocomposite samples was examined. The basic parameters of the room- and low-temperature magnetic hysteresis loops are discussed. To better describe the shape of magnetic hysteresis loop, the authors proposed to consider additional parameters - measures of the exterior angles of the hysteresis curve. Behavior of hysteresis parameters and exterior angles, caused by annealing treatment, was investigated by measuring hysteresis loops at two measured temperatures: 298K, and 5K. Correlation between changes in the behavior of hysteresis parameters and exterior angles was discussed. An attempt has been made to attribute physical meaning to chosen measured angles, which would allow a better understanding of the magnetic hysteresis curve. © 2022, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.
T2  - Journal of Superconductivity and Novel Magnetism
T1  - Magnetic Hysteresis Loops Revisited: Step Closer to Understand the Role of Exterior Angles
VL  - 35
IS  - 5
SP  - 1353
EP  - 1373
DO  - 10.1007/s10948-021-06118-z
ER  - 

@article{
author = "Nikolić, Violeta N. and Rajnak, Michal and Mariano, Jose F. M. L. and Lazarov, Nenad Đ.",
year = "2022",
abstract = "The characterization of nanocomposite samples which contain Cu, Fe-species, prepared by the sol-gel method, was established by Nikolić et al., in a previous article (Nikolić et al. in Journal of Solid State Physics 513:1, 2021). In this study, the magnetic behavior of nanocomposite samples was examined. The basic parameters of the room- and low-temperature magnetic hysteresis loops are discussed. To better describe the shape of magnetic hysteresis loop, the authors proposed to consider additional parameters - measures of the exterior angles of the hysteresis curve. Behavior of hysteresis parameters and exterior angles, caused by annealing treatment, was investigated by measuring hysteresis loops at two measured temperatures: 298K, and 5K. Correlation between changes in the behavior of hysteresis parameters and exterior angles was discussed. An attempt has been made to attribute physical meaning to chosen measured angles, which would allow a better understanding of the magnetic hysteresis curve. © 2022, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.",
journal = "Journal of Superconductivity and Novel Magnetism",
title = "Magnetic Hysteresis Loops Revisited: Step Closer to Understand the Role of Exterior Angles",
volume = "35",
number = "5",
pages = "1353-1373",
doi = "10.1007/s10948-021-06118-z"
}

Nikolić, V. N., Rajnak, M., Mariano, J. F. M. L.,& Lazarov, N. Đ.. (2022). Magnetic Hysteresis Loops Revisited: Step Closer to Understand the Role of Exterior Angles. in Journal of Superconductivity and Novel Magnetism, 35(5), 1353-1373.
https://doi.org/10.1007/s10948-021-06118-z

Nikolić VN, Rajnak M, Mariano JFML, Lazarov NĐ. Magnetic Hysteresis Loops Revisited: Step Closer to Understand the Role of Exterior Angles. in Journal of Superconductivity and Novel Magnetism. 2022;35(5):1353-1373.
doi:10.1007/s10948-021-06118-z .

Nikolić, Violeta N., Rajnak, Michal, Mariano, Jose F. M. L., Lazarov, Nenad Đ., "Magnetic Hysteresis Loops Revisited: Step Closer to Understand the Role of Exterior Angles" in Journal of Superconductivity and Novel Magnetism, 35, no. 5 (2022):1353-1373,
https://doi.org/10.1007/s10948-021-06118-z . .

TY  - CONF
AU  - Lazarov, Nenad Đ.
AU  - Nikolić, Violeta N.
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11235
AB  - Рад се бави учешћем Aлександра Фридмана у теорији великог праска. Познат је по Фридмановим једначинама које описују покретни свемир, тј. свемир који може да се шири, скупља и буде статичан у зависности од параметра к (кривине), у FLRW метрици. Мада су те једначине добили и други, као што је Жорж Леметр (Georges Lemaitre), Фридман их је први добио и објавио 1922 године. Ове једначине се и данас користе за процене астрономских мерења.
AB  - In this paper, we presented the participation of Alexander Friedmann in the Big Bang Theory. He is known for his Friedmman equations which describe the dynamic cosmos, ie. it expands, shrinks, and becomes static in depends on curvature parameter k in FLRW metric. By the way, these equations are given also, by others, such as, for example, Georges Lemaitre. Friedmann have got first equations and published in 1922 year. These equations are used for assessment of astronomical measurements today.
PB  - Belgrade : Astronomical Society "Rudjer Bošković"
C3  - Зборник радова конференције “Развој астрономије код Срба XI”
T1  - Допринос Александра Фридмана теорији великог праска
T1  - The Contribution of Alexander Friedmann to the Big Bang Theory
IS  - 22
SP  - 369
EP  - 380
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11235
ER  - 

@conference{
author = "Lazarov, Nenad Đ. and Nikolić, Violeta N.",
year = "2022",
abstract = "Рад се бави учешћем Aлександра Фридмана у теорији великог праска. Познат је по Фридмановим једначинама које описују покретни свемир, тј. свемир који може да се шири, скупља и буде статичан у зависности од параметра к (кривине), у FLRW метрици. Мада су те једначине добили и други, као што је Жорж Леметр (Georges Lemaitre), Фридман их је први добио и објавио 1922 године. Ове једначине се и данас користе за процене астрономских мерења., In this paper, we presented the participation of Alexander Friedmann in the Big Bang Theory. He is known for his Friedmman equations which describe the dynamic cosmos, ie. it expands, shrinks, and becomes static in depends on curvature parameter k in FLRW metric. By the way, these equations are given also, by others, such as, for example, Georges Lemaitre. Friedmann have got first equations and published in 1922 year. These equations are used for assessment of astronomical measurements today.",
publisher = "Belgrade : Astronomical Society "Rudjer Bošković"",
journal = "Зборник радова конференције “Развој астрономије код Срба XI”",
title = "Допринос Александра Фридмана теорији великог праска, The Contribution of Alexander Friedmann to the Big Bang Theory",
number = "22",
pages = "369-380",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11235"
}

Lazarov, N. Đ.,& Nikolić, V. N.. (2022). Допринос Александра Фридмана теорији великог праска. in Зборник радова конференције “Развој астрономије код Срба XI”
Belgrade : Astronomical Society "Rudjer Bošković".(22), 369-380.
https://hdl.handle.net/21.15107/rcub_vinar_11235

Lazarov NĐ, Nikolić VN. Допринос Александра Фридмана теорији великог праска. in Зборник радова конференције “Развој астрономије код Срба XI”. 2022;(22):369-380.
https://hdl.handle.net/21.15107/rcub_vinar_11235 .

Lazarov, Nenad Đ., Nikolić, Violeta N., "Допринос Александра Фридмана теорији великог праска" in Зборник радова конференције “Развој астрономије код Срба XI”, no. 22 (2022):369-380,
https://hdl.handle.net/21.15107/rcub_vinar_11235 .

TY  - CONF
AU  - Lazarov, Nenad Đ.
AU  - Nikolić, Violeta N.
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11236
AB  - Рад се бави учешћем Жоржа Леметра у теорији великог праска. Његов допринос се огледа у теорији ширења свемира, теорији великог праска и увођењу Леметрових координата. Предложио је теоретске основе свемира који се шири што је потврдио Едвин Хабл. Имао је значајно учешће у формирању Хабловог закона и први је предложио вредност Хаблове константе. Он је такође предложио модел свемира који је назвао хипотеза исконског атома или Космичко јаје.
AB  - In this paper, we represented the participation of Abbe G. Lemaitre’s in the Big Bang Theory. He took part in theory of the expansion of cosmos and made Lemaître coordination system. He proposed the basic theoretical properties of the cosmos, which expands as predicted by Hubble’s law. Also he determined theoretically and experimental form of the Hubble law and first proposed the value of Hubble constant. He proposed model of cosmos which called “the Hypothesis of Primordial Atom” and later called it “the Begining of the World” or “the Cosmic Egg”.
PB  - Belgrade : Astronomical Society "Rudjer Bošković"
C3  - Зборник радова конференције “Развој астрономије код Срба XI”
T1  - Допринос Жоржа Леметра теорији великог праска
T1  - The Contribution of Abbe G. Lemaitre to the Big Bang Theory
IS  - 22
SP  - 381
EP  - 394
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11236
ER  - 

@conference{
author = "Lazarov, Nenad Đ. and Nikolić, Violeta N.",
year = "2022",
abstract = "Рад се бави учешћем Жоржа Леметра у теорији великог праска. Његов допринос се огледа у теорији ширења свемира, теорији великог праска и увођењу Леметрових координата. Предложио је теоретске основе свемира који се шири што је потврдио Едвин Хабл. Имао је значајно учешће у формирању Хабловог закона и први је предложио вредност Хаблове константе. Он је такође предложио модел свемира који је назвао хипотеза исконског атома или Космичко јаје., In this paper, we represented the participation of Abbe G. Lemaitre’s in the Big Bang Theory. He took part in theory of the expansion of cosmos and made Lemaître coordination system. He proposed the basic theoretical properties of the cosmos, which expands as predicted by Hubble’s law. Also he determined theoretically and experimental form of the Hubble law and first proposed the value of Hubble constant. He proposed model of cosmos which called “the Hypothesis of Primordial Atom” and later called it “the Begining of the World” or “the Cosmic Egg”.",
publisher = "Belgrade : Astronomical Society "Rudjer Bošković"",
journal = "Зборник радова конференције “Развој астрономије код Срба XI”",
title = "Допринос Жоржа Леметра теорији великог праска, The Contribution of Abbe G. Lemaitre to the Big Bang Theory",
number = "22",
pages = "381-394",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11236"
}

Lazarov, N. Đ.,& Nikolić, V. N.. (2022). Допринос Жоржа Леметра теорији великог праска. in Зборник радова конференције “Развој астрономије код Срба XI”
Belgrade : Astronomical Society "Rudjer Bošković".(22), 381-394.
https://hdl.handle.net/21.15107/rcub_vinar_11236

Lazarov NĐ, Nikolić VN. Допринос Жоржа Леметра теорији великог праска. in Зборник радова конференције “Развој астрономије код Срба XI”. 2022;(22):381-394.
https://hdl.handle.net/21.15107/rcub_vinar_11236 .

Lazarov, Nenad Đ., Nikolić, Violeta N., "Допринос Жоржа Леметра теорији великог праска" in Зборник радова конференције “Развој астрономије код Срба XI”, no. 22 (2022):381-394,
https://hdl.handle.net/21.15107/rcub_vinar_11236 .

TY  - CONF
AU  - Nikolić, Violeta N.
AU  - Lazarov, Nenad Đ.
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11237
AB  - У раду се дискутују основне информације о астероидима, до којих се дошло након њиховог скоријег открића (XIX век). Имајући у виду да је Србија у време открића првог астероида (1801) још увек била под турском влашћу (за време чије владавине се није придавала посебна пажња науци), а да развој астрономије у нашој земљи, практично, почиње 1926-е године, започињање серије окрића астероида само десет година након тог догађаја (1936), од стране српских научника, представља изванредан успех. Посебно ако узмемо у обзир да је Србија у то време била у веома тешкој геополитичкој ситуацији, јер се налазила између два светска рата. Последично, више пажње у овом раду, посвећено је српском астроному, Петру Ђурковићу, који је започео серију открића астероида, и тиме отворио ново поглавље у српској астрономији.
AB  - In this paper, we represented the participation of Abbe G. Lemaitre’s in the Big Bang Theory. He took part in theory of the expansion of cosmos and made Lemaître coordination system. He proposed the basic theoretical properties of the cosmos, which expands as predicted by Hubble’s law. Also he determined theoretically and experimental form of the Hubble law and first proposed the value of Hubble constant. He proposed model of cosmos which called “the Hypothesis of Primordial Atom” and later called it “the Begining of the World” or “the Cosmic Egg”.
PB  - Belgrade : Astronomical Society "Rudjer Bošković"
C3  - Зборник радова конференције “Развој астрономије код Срба XI”
T1  - Астероиди - небески путници
T1  - Asteroids – Celestrial Travelers
IS  - 22
SP  - 327
EP  - 341
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11237
ER  - 

@conference{
author = "Nikolić, Violeta N. and Lazarov, Nenad Đ.",
year = "2022",
abstract = "У раду се дискутују основне информације о астероидима, до којих се дошло након њиховог скоријег открића (XIX век). Имајући у виду да је Србија у време открића првог астероида (1801) још увек била под турском влашћу (за време чије владавине се није придавала посебна пажња науци), а да развој астрономије у нашој земљи, практично, почиње 1926-е године, започињање серије окрића астероида само десет година након тог догађаја (1936), од стране српских научника, представља изванредан успех. Посебно ако узмемо у обзир да је Србија у то време била у веома тешкој геополитичкој ситуацији, јер се налазила између два светска рата. Последично, више пажње у овом раду, посвећено је српском астроному, Петру Ђурковићу, који је започео серију открића астероида, и тиме отворио ново поглавље у српској астрономији., In this paper, we represented the participation of Abbe G. Lemaitre’s in the Big Bang Theory. He took part in theory of the expansion of cosmos and made Lemaître coordination system. He proposed the basic theoretical properties of the cosmos, which expands as predicted by Hubble’s law. Also he determined theoretically and experimental form of the Hubble law and first proposed the value of Hubble constant. He proposed model of cosmos which called “the Hypothesis of Primordial Atom” and later called it “the Begining of the World” or “the Cosmic Egg”.",
publisher = "Belgrade : Astronomical Society "Rudjer Bošković"",
journal = "Зборник радова конференције “Развој астрономије код Срба XI”",
title = "Астероиди - небески путници, Asteroids – Celestrial Travelers",
number = "22",
pages = "327-341",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11237"
}

Nikolić, V. N.,& Lazarov, N. Đ.. (2022). Астероиди - небески путници. in Зборник радова конференције “Развој астрономије код Срба XI”
Belgrade : Astronomical Society "Rudjer Bošković".(22), 327-341.
https://hdl.handle.net/21.15107/rcub_vinar_11237

Nikolić VN, Lazarov NĐ. Астероиди - небески путници. in Зборник радова конференције “Развој астрономије код Срба XI”. 2022;(22):327-341.
https://hdl.handle.net/21.15107/rcub_vinar_11237 .

Nikolić, Violeta N., Lazarov, Nenad Đ., "Астероиди - небески путници" in Зборник радова конференције “Развој астрономије код Срба XI”, no. 22 (2022):327-341,
https://hdl.handle.net/21.15107/rcub_vinar_11237 .

TY  - JOUR
AU  - Matić, Vladimir M.
AU  - Lazarov, Nenad Đ.
AU  - Milić, Mirjana M.
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5270
AB  - The 60 K plateau of the YBa2Cu3O6+x high-T-c superconducting compound has traditionally been known as a horizontal section in its T-c(x) characteristics within which the critical temperature maintains at a constant level T-c approximate to 60 K. However, recent experiments on a series of high quality single crystals samples of the YBa2Cu3O6+x compound (produced by improved techniques of sample preparation) have shown the 60 K plateau does not manifest itself anymore as a horizontal section of the T-c(x), but emerges as a section over which T-c(x) keeps on continuously rising (the quasi 60 K plateau). Here we propose a theoretical model that explains how the classical (horizontal) 60 K plateau naturally evolves into the quasi 60 K plateau, due to the improved orthorhombicity in the high quality single crystal material accompanied by longer CuO chains. The model assumes that short CuO chains do not contribute to the hole transfer from chains to CuO2 layers, but only chains whose length is greater than, or equal to, a certain threshold length l(cr). Our calculations point to a conclusion that this minimal number of oxygen atoms in a CuO chain, that is required to trigger the hole transfer, is equal to four. The calculated values for T-c(x) are in a very good correlation with the corresponding experimentally obtained results. (C) 2012 Elsevier B. V. All rights reserved.
T2  - Journal of Alloys and Compounds
T1  - A model for the quasi 60 K plateau in the YBa2Cu3O6+x high-T-c compound
VL  - 551
SP  - 189
EP  - 194
DO  - 10.1016/j.jallcom.2012.10.047
ER  - 

@article{
author = "Matić, Vladimir M. and Lazarov, Nenad Đ. and Milić, Mirjana M.",
year = "2013",
abstract = "The 60 K plateau of the YBa2Cu3O6+x high-T-c superconducting compound has traditionally been known as a horizontal section in its T-c(x) characteristics within which the critical temperature maintains at a constant level T-c approximate to 60 K. However, recent experiments on a series of high quality single crystals samples of the YBa2Cu3O6+x compound (produced by improved techniques of sample preparation) have shown the 60 K plateau does not manifest itself anymore as a horizontal section of the T-c(x), but emerges as a section over which T-c(x) keeps on continuously rising (the quasi 60 K plateau). Here we propose a theoretical model that explains how the classical (horizontal) 60 K plateau naturally evolves into the quasi 60 K plateau, due to the improved orthorhombicity in the high quality single crystal material accompanied by longer CuO chains. The model assumes that short CuO chains do not contribute to the hole transfer from chains to CuO2 layers, but only chains whose length is greater than, or equal to, a certain threshold length l(cr). Our calculations point to a conclusion that this minimal number of oxygen atoms in a CuO chain, that is required to trigger the hole transfer, is equal to four. The calculated values for T-c(x) are in a very good correlation with the corresponding experimentally obtained results. (C) 2012 Elsevier B. V. All rights reserved.",
journal = "Journal of Alloys and Compounds",
title = "A model for the quasi 60 K plateau in the YBa2Cu3O6+x high-T-c compound",
volume = "551",
pages = "189-194",
doi = "10.1016/j.jallcom.2012.10.047"
}

Matić, V. M., Lazarov, N. Đ.,& Milić, M. M.. (2013). A model for the quasi 60 K plateau in the YBa2Cu3O6+x high-T-c compound. in Journal of Alloys and Compounds, 551, 189-194.
https://doi.org/10.1016/j.jallcom.2012.10.047

Matić VM, Lazarov NĐ, Milić MM. A model for the quasi 60 K plateau in the YBa2Cu3O6+x high-T-c compound. in Journal of Alloys and Compounds. 2013;551:189-194.
doi:10.1016/j.jallcom.2012.10.047 .

Matić, Vladimir M., Lazarov, Nenad Đ., Milić, Mirjana M., "A model for the quasi 60 K plateau in the YBa2Cu3O6+x high-T-c compound" in Journal of Alloys and Compounds, 551 (2013):189-194,
https://doi.org/10.1016/j.jallcom.2012.10.047 . .

TY  - JOUR
AU  - Matić, Vladimir M.
AU  - Lazarov, Nenad Đ.
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4706
AB  - A model has been proposed to calculate the p(x) and T-c(x) dependences in the Y1-b(Ca)(b)Ba2Cu3O6+x high-T-c cuprate family and applied to b = 0, b = 0.1, and b = 0.2 cases, for which experimental data exist in the literature. The results obtained imply that the Ca efficiency to provide holes is independent of the basal plane oxygen concentration, which is consistent with a view that electrons from CuO2 layers would go primarily to Ca since it is twice closer than oxygen (in addition, the chain oxygen is screened by a layer made up of Ba and O(4) ions). It is shown that, in fully oxygenized compounds (x = 1) the average efficiency, chi, of a chain oxygen to attract an electron from the two nearby layers is reduced by the Ca insertion, though not because the charge transfer mechanism is in itself weakened by Ca, but because a part of electrons that are otherwise available in CuO2 layers has already been removed by the substitution of Y3+ with Ca2+. It has been found that the b-dependence of the average oxygen doping efficiency can be fairly accurately described by the following relation: chi(b) = 0.39 x (1 - 0.786). The calculated p(x) and T-c(x) dependences are in very good agreement with the available experimental data. (C) 2011 Elsevier Ltd. All rights reserved.
T2  - Solid State Communications
T1  - p(x) and T-c(x) characteristics in the Y1-b(Ca)(b)Ba2Cu3O6+x cuprate family
VL  - 152
IS  - 4
SP  - 307
EP  - 310
DO  - 10.1016/j.ssc.2011.11.021
ER  - 

@article{
author = "Matić, Vladimir M. and Lazarov, Nenad Đ.",
year = "2012",
abstract = "A model has been proposed to calculate the p(x) and T-c(x) dependences in the Y1-b(Ca)(b)Ba2Cu3O6+x high-T-c cuprate family and applied to b = 0, b = 0.1, and b = 0.2 cases, for which experimental data exist in the literature. The results obtained imply that the Ca efficiency to provide holes is independent of the basal plane oxygen concentration, which is consistent with a view that electrons from CuO2 layers would go primarily to Ca since it is twice closer than oxygen (in addition, the chain oxygen is screened by a layer made up of Ba and O(4) ions). It is shown that, in fully oxygenized compounds (x = 1) the average efficiency, chi, of a chain oxygen to attract an electron from the two nearby layers is reduced by the Ca insertion, though not because the charge transfer mechanism is in itself weakened by Ca, but because a part of electrons that are otherwise available in CuO2 layers has already been removed by the substitution of Y3+ with Ca2+. It has been found that the b-dependence of the average oxygen doping efficiency can be fairly accurately described by the following relation: chi(b) = 0.39 x (1 - 0.786). The calculated p(x) and T-c(x) dependences are in very good agreement with the available experimental data. (C) 2011 Elsevier Ltd. All rights reserved.",
journal = "Solid State Communications",
title = "p(x) and T-c(x) characteristics in the Y1-b(Ca)(b)Ba2Cu3O6+x cuprate family",
volume = "152",
number = "4",
pages = "307-310",
doi = "10.1016/j.ssc.2011.11.021"
}

Matić, V. M.,& Lazarov, N. Đ.. (2012). p(x) and T-c(x) characteristics in the Y1-b(Ca)(b)Ba2Cu3O6+x cuprate family. in Solid State Communications, 152(4), 307-310.
https://doi.org/10.1016/j.ssc.2011.11.021

Matić VM, Lazarov NĐ. p(x) and T-c(x) characteristics in the Y1-b(Ca)(b)Ba2Cu3O6+x cuprate family. in Solid State Communications. 2012;152(4):307-310.
doi:10.1016/j.ssc.2011.11.021 .

Matić, Vladimir M., Lazarov, Nenad Đ., "p(x) and T-c(x) characteristics in the Y1-b(Ca)(b)Ba2Cu3O6+x cuprate family" in Solid State Communications, 152, no. 4 (2012):307-310,
https://doi.org/10.1016/j.ssc.2011.11.021 . .

TY  - JOUR
AU  - Milić, Mirjana M.
AU  - Lazarov, Nenad Đ.
AU  - Karbunar, Lazar
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4798
AB  - In the present study, we have employed two dimensional ASYNNNI model to investigate how the Ortho-II structure formation influences doping, p, of the superconducting CuO2 planes in YBa2Cu3O6+x high-T-c superconductor. It was shown, that if the direct repulsive interaction between next nearest oxygen atoms (V-3), present in the Hamiltonian of the ASYNNNI model, is neglected, the Ortho-II ordering is destroyed and doping p becomes a linearly increasing function of oxygen concentration x in the range 0.50 LT = x LT = 0.65, for any choice of critical chain length l(cr) (defined so that CuO chains of length l LT l(cr) cannot transfer holes to the CuO2 planes). Consequently, the T-c(x) dependence, obtained by the employment of the universal T-c vs. p relation, does not exhibit experimentally observed 60 K plateau. The results presented here confirm that establishment of Ortho-II structural phase is a key factor for the 60 K plateau formation in the T-c(x) dependence. (C) 2012 Elsevier B. V. All rights reserved.
T2  - Physica. C: Superconductivity and Its Applications
T1  - Influence of Ortho-II structural phase on the 60 K plateau formation in YBa2Cu3O6+x
VL  - 476
SP  - 63
EP  - 67
DO  - 10.1016/j.physc.2012.02.008
ER  - 

@article{
author = "Milić, Mirjana M. and Lazarov, Nenad Đ. and Karbunar, Lazar",
year = "2012",
abstract = "In the present study, we have employed two dimensional ASYNNNI model to investigate how the Ortho-II structure formation influences doping, p, of the superconducting CuO2 planes in YBa2Cu3O6+x high-T-c superconductor. It was shown, that if the direct repulsive interaction between next nearest oxygen atoms (V-3), present in the Hamiltonian of the ASYNNNI model, is neglected, the Ortho-II ordering is destroyed and doping p becomes a linearly increasing function of oxygen concentration x in the range 0.50 LT = x LT = 0.65, for any choice of critical chain length l(cr) (defined so that CuO chains of length l LT l(cr) cannot transfer holes to the CuO2 planes). Consequently, the T-c(x) dependence, obtained by the employment of the universal T-c vs. p relation, does not exhibit experimentally observed 60 K plateau. The results presented here confirm that establishment of Ortho-II structural phase is a key factor for the 60 K plateau formation in the T-c(x) dependence. (C) 2012 Elsevier B. V. All rights reserved.",
journal = "Physica. C: Superconductivity and Its Applications",
title = "Influence of Ortho-II structural phase on the 60 K plateau formation in YBa2Cu3O6+x",
volume = "476",
pages = "63-67",
doi = "10.1016/j.physc.2012.02.008"
}

Milić, M. M., Lazarov, N. Đ.,& Karbunar, L.. (2012). Influence of Ortho-II structural phase on the 60 K plateau formation in YBa2Cu3O6+x. in Physica. C: Superconductivity and Its Applications, 476, 63-67.
https://doi.org/10.1016/j.physc.2012.02.008

Milić MM, Lazarov NĐ, Karbunar L. Influence of Ortho-II structural phase on the 60 K plateau formation in YBa2Cu3O6+x. in Physica. C: Superconductivity and Its Applications. 2012;476:63-67.
doi:10.1016/j.physc.2012.02.008 .

Milić, Mirjana M., Lazarov, Nenad Đ., Karbunar, Lazar, "Influence of Ortho-II structural phase on the 60 K plateau formation in YBa2Cu3O6+x" in Physica. C: Superconductivity and Its Applications, 476 (2012):63-67,
https://doi.org/10.1016/j.physc.2012.02.008 . .

TY  - JOUR
AU  - Matić, Vladimir M.
AU  - Lazarov, Nenad Đ.
AU  - Milić, Mirjana M.
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5155
AB  - A model for the chain-to-plane charge transfer is proposed to account for the two plateaus, at 60 K and at 90 K, of the T-c(x) characteristics of the YBa2Cu3O6+x high-T-c superconductor. It is assumed that the number of holes transferred from a CuO chain of length l to two nearby CuO2 sheets is proportional to l (that is, to the number of oxygen atoms in the chain), if the chain length is greater than, or equal to, a certain critical chain length, l(cr), that is required to trigger the charge transfer process. No holes are assumed to have been transferred from chains of length l LT l(cr). The calculated T-c(x) dependence is found to be in excellent agreement with the experimentally reported T-c(x). The critical chain length parameter is estimated to be equal to l(cr) = 11 (eleven oxygen atoms in a chain), which is a greater value than that obtained in the previously proposed model for the chain-to-plane charge transfer (l(cr) = 4). The results obtained out of the proposed model are briefly discussed.
T2  - Chinese Physics B
T1  - A model for the chain-to-plane charge transfer in YBa2Cu3O6+x
VL  - 21
IS  - 11
DO  - 10.1088/1674-1056/21/11/117401
ER  - 

@article{
author = "Matić, Vladimir M. and Lazarov, Nenad Đ. and Milić, Mirjana M.",
year = "2012",
abstract = "A model for the chain-to-plane charge transfer is proposed to account for the two plateaus, at 60 K and at 90 K, of the T-c(x) characteristics of the YBa2Cu3O6+x high-T-c superconductor. It is assumed that the number of holes transferred from a CuO chain of length l to two nearby CuO2 sheets is proportional to l (that is, to the number of oxygen atoms in the chain), if the chain length is greater than, or equal to, a certain critical chain length, l(cr), that is required to trigger the charge transfer process. No holes are assumed to have been transferred from chains of length l LT l(cr). The calculated T-c(x) dependence is found to be in excellent agreement with the experimentally reported T-c(x). The critical chain length parameter is estimated to be equal to l(cr) = 11 (eleven oxygen atoms in a chain), which is a greater value than that obtained in the previously proposed model for the chain-to-plane charge transfer (l(cr) = 4). The results obtained out of the proposed model are briefly discussed.",
journal = "Chinese Physics B",
title = "A model for the chain-to-plane charge transfer in YBa2Cu3O6+x",
volume = "21",
number = "11",
doi = "10.1088/1674-1056/21/11/117401"
}

Matić, V. M., Lazarov, N. Đ.,& Milić, M. M.. (2012). A model for the chain-to-plane charge transfer in YBa2Cu3O6+x. in Chinese Physics B, 21(11).
https://doi.org/10.1088/1674-1056/21/11/117401

Matić VM, Lazarov NĐ, Milić MM. A model for the chain-to-plane charge transfer in YBa2Cu3O6+x. in Chinese Physics B. 2012;21(11).
doi:10.1088/1674-1056/21/11/117401 .

Matić, Vladimir M., Lazarov, Nenad Đ., Milić, Mirjana M., "A model for the chain-to-plane charge transfer in YBa2Cu3O6+x" in Chinese Physics B, 21, no. 11 (2012),
https://doi.org/10.1088/1674-1056/21/11/117401 . .

TY  - JOUR
AU  - Milić, Mirjana M.
AU  - Lazarov, Nenad Đ.
AU  - Cucic, D. A.
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6961
AB  - Effect of the long term illumination of the YBa2Cu3O6+x with visible light or ultraviolet irradiation on its superconducting properties was studied in the frame of a simple theoretical model, which assumes that photodoping triggers rearrangement of oxygen monomers in the chain layers thus causing the enhancement of the average chain length, l(av). Since, according to the model of charge transfer mechanism, long CuO chains are better electronic hole donors than the short ones, increase of the average chain length induces additional holes transfer from chain layers to the superconducting CuO2 planes which in turn leads to the increase of the superconducting transition temperature T-c. By the use of the expression for the chain length probability distribution and numerically calculated values for the average chain length in the non-excited system, we were able to estimate the doping p (number of holes per one Cu atom in the superconducting CuO2 planes) and T-c enhancement due to photo-induced oxygen reordering. The theoretical results are compared with available experimental data. (C) 2011 Elsevier B.V. All rights reserved.
T2  - Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms
T1  - Study on the photo-induced oxygen reordering in YBa2Cu3O6+x
VL  - 279
SP  - 212
EP  - 214
DO  - 10.1016/j.nimb.2011.10.035
ER  - 

@article{
author = "Milić, Mirjana M. and Lazarov, Nenad Đ. and Cucic, D. A.",
year = "2012",
abstract = "Effect of the long term illumination of the YBa2Cu3O6+x with visible light or ultraviolet irradiation on its superconducting properties was studied in the frame of a simple theoretical model, which assumes that photodoping triggers rearrangement of oxygen monomers in the chain layers thus causing the enhancement of the average chain length, l(av). Since, according to the model of charge transfer mechanism, long CuO chains are better electronic hole donors than the short ones, increase of the average chain length induces additional holes transfer from chain layers to the superconducting CuO2 planes which in turn leads to the increase of the superconducting transition temperature T-c. By the use of the expression for the chain length probability distribution and numerically calculated values for the average chain length in the non-excited system, we were able to estimate the doping p (number of holes per one Cu atom in the superconducting CuO2 planes) and T-c enhancement due to photo-induced oxygen reordering. The theoretical results are compared with available experimental data. (C) 2011 Elsevier B.V. All rights reserved.",
journal = "Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms",
title = "Study on the photo-induced oxygen reordering in YBa2Cu3O6+x",
volume = "279",
pages = "212-214",
doi = "10.1016/j.nimb.2011.10.035"
}

Milić, M. M., Lazarov, N. Đ.,& Cucic, D. A.. (2012). Study on the photo-induced oxygen reordering in YBa2Cu3O6+x. in Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms, 279, 212-214.
https://doi.org/10.1016/j.nimb.2011.10.035

Milić MM, Lazarov NĐ, Cucic DA. Study on the photo-induced oxygen reordering in YBa2Cu3O6+x. in Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms. 2012;279:212-214.
doi:10.1016/j.nimb.2011.10.035 .

Milić, Mirjana M., Lazarov, Nenad Đ., Cucic, D. A., "Study on the photo-induced oxygen reordering in YBa2Cu3O6+x" in Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms, 279 (2012):212-214,
https://doi.org/10.1016/j.nimb.2011.10.035 . .

TY  - JOUR
AU  - Lazarov, Nenad Đ.
AU  - Milić, Mirjana M.
AU  - Cucic, D. A.
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6962
AB  - In the present study, we have employed two dimensional ASYNNNI model and the numerical Monte Carlo simulations to investigate the effect of visible light or ultraviolet radiation on the doping p of the superconducting CuO2 planes, and consequently on the superconducting transition temperature T-c, in YBa2Cu3O6+x high-T-c superconductor. It was shown that, depending on the oxygen concentration, x, three regions of different critical temperatures T-c behavior could be distinguished. In the first region where x LT 0.6 the critical temperature increases rapidly with oxygen depletion, in the second region, 0.6 LT x LT 0.75, the total T-c change, delta T-c, is almost independent of the oxygen content thus forming some kind of plateau, while in the third region, 0.75 LT x LT 1.0, the T-c does not increase significantly. Such a theoretically obtained behavior of T-c is in general agreement with the experimentally established facts on the delta 7(c), vs. x dependence. (C) 2011 Elsevier B.V. All rights reserved.
T2  - Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms
T1  - Effect of illumination on the superconducting transition temperature T-c in YBa2Cu3O6+x
VL  - 279
SP  - 215
EP  - 218
DO  - 10.1016/j.nimb.2011.10.044
ER  - 

@article{
author = "Lazarov, Nenad Đ. and Milić, Mirjana M. and Cucic, D. A.",
year = "2012",
abstract = "In the present study, we have employed two dimensional ASYNNNI model and the numerical Monte Carlo simulations to investigate the effect of visible light or ultraviolet radiation on the doping p of the superconducting CuO2 planes, and consequently on the superconducting transition temperature T-c, in YBa2Cu3O6+x high-T-c superconductor. It was shown that, depending on the oxygen concentration, x, three regions of different critical temperatures T-c behavior could be distinguished. In the first region where x LT 0.6 the critical temperature increases rapidly with oxygen depletion, in the second region, 0.6 LT x LT 0.75, the total T-c change, delta T-c, is almost independent of the oxygen content thus forming some kind of plateau, while in the third region, 0.75 LT x LT 1.0, the T-c does not increase significantly. Such a theoretically obtained behavior of T-c is in general agreement with the experimentally established facts on the delta 7(c), vs. x dependence. (C) 2011 Elsevier B.V. All rights reserved.",
journal = "Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms",
title = "Effect of illumination on the superconducting transition temperature T-c in YBa2Cu3O6+x",
volume = "279",
pages = "215-218",
doi = "10.1016/j.nimb.2011.10.044"
}

Lazarov, N. Đ., Milić, M. M.,& Cucic, D. A.. (2012). Effect of illumination on the superconducting transition temperature T-c in YBa2Cu3O6+x. in Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms, 279, 215-218.
https://doi.org/10.1016/j.nimb.2011.10.044

Lazarov NĐ, Milić MM, Cucic DA. Effect of illumination on the superconducting transition temperature T-c in YBa2Cu3O6+x. in Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms. 2012;279:215-218.
doi:10.1016/j.nimb.2011.10.044 .

Lazarov, Nenad Đ., Milić, Mirjana M., Cucic, D. A., "Effect of illumination on the superconducting transition temperature T-c in YBa2Cu3O6+x" in Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms, 279 (2012):215-218,
https://doi.org/10.1016/j.nimb.2011.10.044 . .

TY  - JOUR
AU  - Milić, Mirjana M.
AU  - Matić, Vladimir M.
AU  - Lazarov, Nenad Đ.
PY  - 2011
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4227
AB  - An extended ASYNNNI model, that beside nearest-neighbour and next-nearest neighbour O-O interactions in the basal plane also includes interactions between the three nearest oxygen atoms, is used to describe the statistics of CuO chain fragmentation and to calculate doping and T (c) in YBa2Cu3O6+x . Calculations were made by the Monte Carlo method employing the recently proposed charge transfer model that assumes only chains whose length is equal to, or exceeds, a characteristic (critical) length, l (cr) , can provide holes to the layers and contribute to doping p. The obtained p(x) is then combined with a universal T (c) versus p relation to yield T (c) (x) characteristics that correlate remarkably with those reported in recent experiments. The best coordination between theoretical and experimental T (c) (x) characteristics has been achieved for l (cr) = 2, implying that only isolated basal plane oxygen atoms (trivial chains) do not contribute holes to CuO2 layers.
T2  - Central European Journal of Physics
T1  - The dependence of critical temperature on oxygen concentration in YBa2Cu3O6+x in terms of the fragmented chain model
VL  - 9
IS  - 3
SP  - 690
EP  - 697
DO  - 10.2478/s11534-010-0060-6
ER  - 

@article{
author = "Milić, Mirjana M. and Matić, Vladimir M. and Lazarov, Nenad Đ.",
year = "2011",
abstract = "An extended ASYNNNI model, that beside nearest-neighbour and next-nearest neighbour O-O interactions in the basal plane also includes interactions between the three nearest oxygen atoms, is used to describe the statistics of CuO chain fragmentation and to calculate doping and T (c) in YBa2Cu3O6+x . Calculations were made by the Monte Carlo method employing the recently proposed charge transfer model that assumes only chains whose length is equal to, or exceeds, a characteristic (critical) length, l (cr) , can provide holes to the layers and contribute to doping p. The obtained p(x) is then combined with a universal T (c) versus p relation to yield T (c) (x) characteristics that correlate remarkably with those reported in recent experiments. The best coordination between theoretical and experimental T (c) (x) characteristics has been achieved for l (cr) = 2, implying that only isolated basal plane oxygen atoms (trivial chains) do not contribute holes to CuO2 layers.",
journal = "Central European Journal of Physics",
title = "The dependence of critical temperature on oxygen concentration in YBa2Cu3O6+x in terms of the fragmented chain model",
volume = "9",
number = "3",
pages = "690-697",
doi = "10.2478/s11534-010-0060-6"
}

Milić, M. M., Matić, V. M.,& Lazarov, N. Đ.. (2011). The dependence of critical temperature on oxygen concentration in YBa2Cu3O6+x in terms of the fragmented chain model. in Central European Journal of Physics, 9(3), 690-697.
https://doi.org/10.2478/s11534-010-0060-6

Milić MM, Matić VM, Lazarov NĐ. The dependence of critical temperature on oxygen concentration in YBa2Cu3O6+x in terms of the fragmented chain model. in Central European Journal of Physics. 2011;9(3):690-697.
doi:10.2478/s11534-010-0060-6 .

Milić, Mirjana M., Matić, Vladimir M., Lazarov, Nenad Đ., "The dependence of critical temperature on oxygen concentration in YBa2Cu3O6+x in terms of the fragmented chain model" in Central European Journal of Physics, 9, no. 3 (2011):690-697,
https://doi.org/10.2478/s11534-010-0060-6 . .

TY  - JOUR
AU  - Matić, Vladimir M.
AU  - Lazarov, Nenad Đ.
AU  - Bradarić, Ivica
PY  - 2008
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3463
AB  - We propose a model for the charge transfer mechanism in Y0.8(Ca)0.2Ba2Cu3O6+x to count the hole doping of CuO2 planes and the x dependence of the critical transition temperature Tc. It is assumed that the total number of doped holes in the planes is the sum of the numbers of holes that are introduced through two separate channels: substitution of Y3+ by Ca2+ and from CuO chains that are longer than a minimal (critical) length lmin needed for charge transfer to take place. The Tc(x) dependence is obtained by combining the calculated x dependence of doping, p(x), and the universal Tc versus p relation. Although calculated Tc(x) dependences for lmin = 3 and 4 both correlate remarkably well with the experimental Tc(x), we argue that the value lmin = 3 gives a reasonable overall agreement.
T2  - Superconductor Science and Technology
T1  - Charge transfer mechanism and T-c(x) dependence in Y-0.8(Ca)(0.2)Ba2Cu3O6+x
VL  - 21
IS  - 7
SP  - 075012
DO  - 10.1088/0953-2048/21/7/075012
ER  - 

@article{
author = "Matić, Vladimir M. and Lazarov, Nenad Đ. and Bradarić, Ivica",
year = "2008",
abstract = "We propose a model for the charge transfer mechanism in Y0.8(Ca)0.2Ba2Cu3O6+x to count the hole doping of CuO2 planes and the x dependence of the critical transition temperature Tc. It is assumed that the total number of doped holes in the planes is the sum of the numbers of holes that are introduced through two separate channels: substitution of Y3+ by Ca2+ and from CuO chains that are longer than a minimal (critical) length lmin needed for charge transfer to take place. The Tc(x) dependence is obtained by combining the calculated x dependence of doping, p(x), and the universal Tc versus p relation. Although calculated Tc(x) dependences for lmin = 3 and 4 both correlate remarkably well with the experimental Tc(x), we argue that the value lmin = 3 gives a reasonable overall agreement.",
journal = "Superconductor Science and Technology",
title = "Charge transfer mechanism and T-c(x) dependence in Y-0.8(Ca)(0.2)Ba2Cu3O6+x",
volume = "21",
number = "7",
pages = "075012",
doi = "10.1088/0953-2048/21/7/075012"
}

Matić, V. M., Lazarov, N. Đ.,& Bradarić, I.. (2008). Charge transfer mechanism and T-c(x) dependence in Y-0.8(Ca)(0.2)Ba2Cu3O6+x. in Superconductor Science and Technology, 21(7), 075012.
https://doi.org/10.1088/0953-2048/21/7/075012

Matić VM, Lazarov NĐ, Bradarić I. Charge transfer mechanism and T-c(x) dependence in Y-0.8(Ca)(0.2)Ba2Cu3O6+x. in Superconductor Science and Technology. 2008;21(7):075012.
doi:10.1088/0953-2048/21/7/075012 .

Matić, Vladimir M., Lazarov, Nenad Đ., Bradarić, Ivica, "Charge transfer mechanism and T-c(x) dependence in Y-0.8(Ca)(0.2)Ba2Cu3O6+x" in Superconductor Science and Technology, 21, no. 7 (2008):075012,
https://doi.org/10.1088/0953-2048/21/7/075012 . .

TY  - JOUR
AU  - Matić, Vladimir M.
AU  - Lazarov, Nenad Đ.
PY  - 2007
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3195
AB  - A model of charge transfer mechanism from CuO chains to CuO2 planes has been proposed to account for doping of the planes, assuming that only chains containing more than three oxygen atoms can contribute to hole transfer. Only chains with l GT 4 are assumed to have transferred a certain fraction, approximately 40%, of the holes created by oxygen added to the chain beyond the first three oxygen atoms. Using the so obtained x dependence of doping, p(x), at constant (room) temperature and utilizing empirical parabolic phase relation T,(p) (T-c(P) = T-c,max[1 - 82.6(p(x) - 0.16)(2)]), the T-c versus x dependence is found to have two clearly distinguished plateaus at 60 and 90 K, remarkably fitting to experimental Tc(x). The effect of statistics of CuO chain fragmentation has been included by applying cluster variation method to two dimensional asymmetric next-nearest-neighbor Ising model that is employed to describe oxygen-chain ordering in basal planes. The obtained results indicate that plateaus, coinciding with T(c)(x) = 0, emerge either when p(x) = 0 (p(x) approximate to const), in the region of OH phase formation (the 60 K plateau), or when p = 0.16, representing the optimal doping at x approximate to 0.91 in OII phase (the 90 K plateau). (c) 2007 Elsevier Ltd. All rights reserved.
T2  - Solid State Communications
T1  - Impact of chain fragmentation on charge transfer scenario and two-plateaus-like behavior of T-c(x) in YBa2Cu3O6+x
VL  - 142
IS  - 3
SP  - 165
EP  - 168
DO  - 10.1016/j.ssc.2007.01.041
ER  - 

@article{
author = "Matić, Vladimir M. and Lazarov, Nenad Đ.",
year = "2007",
abstract = "A model of charge transfer mechanism from CuO chains to CuO2 planes has been proposed to account for doping of the planes, assuming that only chains containing more than three oxygen atoms can contribute to hole transfer. Only chains with l GT 4 are assumed to have transferred a certain fraction, approximately 40%, of the holes created by oxygen added to the chain beyond the first three oxygen atoms. Using the so obtained x dependence of doping, p(x), at constant (room) temperature and utilizing empirical parabolic phase relation T,(p) (T-c(P) = T-c,max[1 - 82.6(p(x) - 0.16)(2)]), the T-c versus x dependence is found to have two clearly distinguished plateaus at 60 and 90 K, remarkably fitting to experimental Tc(x). The effect of statistics of CuO chain fragmentation has been included by applying cluster variation method to two dimensional asymmetric next-nearest-neighbor Ising model that is employed to describe oxygen-chain ordering in basal planes. The obtained results indicate that plateaus, coinciding with T(c)(x) = 0, emerge either when p(x) = 0 (p(x) approximate to const), in the region of OH phase formation (the 60 K plateau), or when p = 0.16, representing the optimal doping at x approximate to 0.91 in OII phase (the 90 K plateau). (c) 2007 Elsevier Ltd. All rights reserved.",
journal = "Solid State Communications",
title = "Impact of chain fragmentation on charge transfer scenario and two-plateaus-like behavior of T-c(x) in YBa2Cu3O6+x",
volume = "142",
number = "3",
pages = "165-168",
doi = "10.1016/j.ssc.2007.01.041"
}

Matić, V. M.,& Lazarov, N. Đ.. (2007). Impact of chain fragmentation on charge transfer scenario and two-plateaus-like behavior of T-c(x) in YBa2Cu3O6+x. in Solid State Communications, 142(3), 165-168.
https://doi.org/10.1016/j.ssc.2007.01.041

Matić VM, Lazarov NĐ. Impact of chain fragmentation on charge transfer scenario and two-plateaus-like behavior of T-c(x) in YBa2Cu3O6+x. in Solid State Communications. 2007;142(3):165-168.
doi:10.1016/j.ssc.2007.01.041 .

Matić, Vladimir M., Lazarov, Nenad Đ., "Impact of chain fragmentation on charge transfer scenario and two-plateaus-like behavior of T-c(x) in YBa2Cu3O6+x" in Solid State Communications, 142, no. 3 (2007):165-168,
https://doi.org/10.1016/j.ssc.2007.01.041 . .

TY  - JOUR
AU  - Matić, Vladimir M.
AU  - Lazarov, Nenad Đ.
PY  - 2007
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3234
AB  - A model for the charge transfer mechanism in YBa(2)Cu(3)O(6+x) high-T(c) cuprate based on the critical chain length concept is proposed to account for the 60 and 90 K plateaus in the T(c)(x) dependence. It has been shown that, when the statistics of CuO chain formation was described in terms of the two-dimensional asymmetric next-to-nearest neighbor Ising (ASYNNNI) model, at any constant temperature below the top of ortho-II phase there exists a uniquely defined value of critical chain length l(cr)(T) that yields a constant doping p(x) approximate to const over the regime of ortho-II phase (related to the 60 K plateau of T(c)(x)), while the 90 K plateau coincides with the monotonically increasing p(x) over the optimal doping level p = 0.16 in the regime of the ortho-I phase. Short length chains (l LT l(cr)(T)), together with the first l(cr)(T)-2 holes in longer chains (l GT = l(cr)(T)), are taken as not capable of attracting electrons from CuO(2) planes. It is shown that only a part (approximate to 41%) of the remaining l - l(cr)(T)+1 holes in the long chains can capture electrons. The results obtained indicate that the ASYNNNI model and two-plateau-like behavior of T(c)(x) in YBa(2)Cu(3)O(6+x) are closely connected.
T2  - Journal of Physics: Condensed Matter
T1  - The origin of the 60 K plateau in YBa(2)Cu(3)O(6+x)
VL  - 19
IS  - 34
DO  - 10.1088/0953-8984/19/34/346230
ER  - 

@article{
author = "Matić, Vladimir M. and Lazarov, Nenad Đ.",
year = "2007",
abstract = "A model for the charge transfer mechanism in YBa(2)Cu(3)O(6+x) high-T(c) cuprate based on the critical chain length concept is proposed to account for the 60 and 90 K plateaus in the T(c)(x) dependence. It has been shown that, when the statistics of CuO chain formation was described in terms of the two-dimensional asymmetric next-to-nearest neighbor Ising (ASYNNNI) model, at any constant temperature below the top of ortho-II phase there exists a uniquely defined value of critical chain length l(cr)(T) that yields a constant doping p(x) approximate to const over the regime of ortho-II phase (related to the 60 K plateau of T(c)(x)), while the 90 K plateau coincides with the monotonically increasing p(x) over the optimal doping level p = 0.16 in the regime of the ortho-I phase. Short length chains (l LT l(cr)(T)), together with the first l(cr)(T)-2 holes in longer chains (l GT = l(cr)(T)), are taken as not capable of attracting electrons from CuO(2) planes. It is shown that only a part (approximate to 41%) of the remaining l - l(cr)(T)+1 holes in the long chains can capture electrons. The results obtained indicate that the ASYNNNI model and two-plateau-like behavior of T(c)(x) in YBa(2)Cu(3)O(6+x) are closely connected.",
journal = "Journal of Physics: Condensed Matter",
title = "The origin of the 60 K plateau in YBa(2)Cu(3)O(6+x)",
volume = "19",
number = "34",
doi = "10.1088/0953-8984/19/34/346230"
}

Matić, V. M.,& Lazarov, N. Đ.. (2007). The origin of the 60 K plateau in YBa(2)Cu(3)O(6+x). in Journal of Physics: Condensed Matter, 19(34).
https://doi.org/10.1088/0953-8984/19/34/346230

Matić VM, Lazarov NĐ. The origin of the 60 K plateau in YBa(2)Cu(3)O(6+x). in Journal of Physics: Condensed Matter. 2007;19(34).
doi:10.1088/0953-8984/19/34/346230 .

Matić, Vladimir M., Lazarov, Nenad Đ., "The origin of the 60 K plateau in YBa(2)Cu(3)O(6+x)" in Journal of Physics: Condensed Matter, 19, no. 34 (2007),
https://doi.org/10.1088/0953-8984/19/34/346230 . .

TY  - JOUR
AU  - Lazarov, Nenad Đ.
AU  - Spasojević, Vojislav
AU  - Matić, Vladimir M.
AU  - Kusigerski, Vladan
AU  - Guillot, Maurice
PY  - 2007
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3493
AB  - Magnetic properties of the dinuclear cobalt complex [Co-2(ox)tpmc](ClO4)(2)center dot 3H(2)O have been studied from the magnetization data obtained in the high magnetic field-low temperature experiments (B LT = 20 T, 2.2 K LT = T LT = 29 K). An excellent agreement between experimental and calculated data for all experimental temperatures was achieved within the framework of the isolated Ning Co(II) pairs in the ground state, where each cobalt ion from the pair was situated in a differently distorted octahedral environment (asymmetric dimer). The obtained values for g-factors (g(a) and g(b)), and for the intracluster exchange integral J/k(B) = (-16.0 +/- 0.5) K confirm both the previous results on the crystal structure of the complex under consideration and the assumption on the strong antiferromagnetic coupling between cobalt ions realized by the superexchange interaction over the asymmetric oxalato bridge.
T2  - Revue Roumaine de Chimie
T1  - Magnetic properties of asymmetric Co(II) dimer at low temperatures
VL  - 52
IS  - 11
SP  - 1027
EP  - 1031
UR  - https://hdl.handle.net/21.15107/rcub_vinar_3493
ER  - 

@article{
author = "Lazarov, Nenad Đ. and Spasojević, Vojislav and Matić, Vladimir M. and Kusigerski, Vladan and Guillot, Maurice",
year = "2007",
abstract = "Magnetic properties of the dinuclear cobalt complex [Co-2(ox)tpmc](ClO4)(2)center dot 3H(2)O have been studied from the magnetization data obtained in the high magnetic field-low temperature experiments (B LT = 20 T, 2.2 K LT = T LT = 29 K). An excellent agreement between experimental and calculated data for all experimental temperatures was achieved within the framework of the isolated Ning Co(II) pairs in the ground state, where each cobalt ion from the pair was situated in a differently distorted octahedral environment (asymmetric dimer). The obtained values for g-factors (g(a) and g(b)), and for the intracluster exchange integral J/k(B) = (-16.0 +/- 0.5) K confirm both the previous results on the crystal structure of the complex under consideration and the assumption on the strong antiferromagnetic coupling between cobalt ions realized by the superexchange interaction over the asymmetric oxalato bridge.",
journal = "Revue Roumaine de Chimie",
title = "Magnetic properties of asymmetric Co(II) dimer at low temperatures",
volume = "52",
number = "11",
pages = "1027-1031",
url = "https://hdl.handle.net/21.15107/rcub_vinar_3493"
}

Lazarov, N. Đ., Spasojević, V., Matić, V. M., Kusigerski, V.,& Guillot, M.. (2007). Magnetic properties of asymmetric Co(II) dimer at low temperatures. in Revue Roumaine de Chimie, 52(11), 1027-1031.
https://hdl.handle.net/21.15107/rcub_vinar_3493

Lazarov NĐ, Spasojević V, Matić VM, Kusigerski V, Guillot M. Magnetic properties of asymmetric Co(II) dimer at low temperatures. in Revue Roumaine de Chimie. 2007;52(11):1027-1031.
https://hdl.handle.net/21.15107/rcub_vinar_3493 .

Lazarov, Nenad Đ., Spasojević, Vojislav, Matić, Vladimir M., Kusigerski, Vladan, Guillot, Maurice, "Magnetic properties of asymmetric Co(II) dimer at low temperatures" in Revue Roumaine de Chimie, 52, no. 11 (2007):1027-1031,
https://hdl.handle.net/21.15107/rcub_vinar_3493 .

TY  - JOUR
AU  - Milić, Mirjana M.
AU  - Lazarov, Nenad Đ.
AU  - Matić, Vladimir M.
PY  - 2007
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6702
AB  - According to the charge transfer model of Kudinov et a]. the photoinduced enhancement of conductivity in YBa2Cu3O6+x material can be explained by the photoexcitation of electron-hole pairs, and the subsequent transfer of electrons to the oxygen deficient CuOx planes where they become trapped in the CuO chain fragments, while the holes remain free in the superconducting CUO2 planes contributing to the superconducting current. In this paper we have employed the numerical cluster variation method (CVM) and the recently established relation between chain probability distribution p(n) and the average chain length n(av), to calculate the number of electrons being captured in the unoccupied p orbitals of O- ions incorporated in the CuO chains, thus producing the free holes in the CUO2 planes. Our results support the standing that several processes make contribution to the effects of persistent photoconductivity and photoinduced superconductivity. (C) 2007 Elsevier B.V. All rights reserved.
T2  - Physica. C: Superconductivity and Its Applications
T1  - Cluster variation method investigation of photoinduced charge transfer in YBa2Cu3O6+x material
VL  - 460
SP  - 364
EP  - 365
DO  - 10.1016/j.physc.2007.03.051
ER  - 

@article{
author = "Milić, Mirjana M. and Lazarov, Nenad Đ. and Matić, Vladimir M.",
year = "2007",
abstract = "According to the charge transfer model of Kudinov et a]. the photoinduced enhancement of conductivity in YBa2Cu3O6+x material can be explained by the photoexcitation of electron-hole pairs, and the subsequent transfer of electrons to the oxygen deficient CuOx planes where they become trapped in the CuO chain fragments, while the holes remain free in the superconducting CUO2 planes contributing to the superconducting current. In this paper we have employed the numerical cluster variation method (CVM) and the recently established relation between chain probability distribution p(n) and the average chain length n(av), to calculate the number of electrons being captured in the unoccupied p orbitals of O- ions incorporated in the CuO chains, thus producing the free holes in the CUO2 planes. Our results support the standing that several processes make contribution to the effects of persistent photoconductivity and photoinduced superconductivity. (C) 2007 Elsevier B.V. All rights reserved.",
journal = "Physica. C: Superconductivity and Its Applications",
title = "Cluster variation method investigation of photoinduced charge transfer in YBa2Cu3O6+x material",
volume = "460",
pages = "364-365",
doi = "10.1016/j.physc.2007.03.051"
}

Milić, M. M., Lazarov, N. Đ.,& Matić, V. M.. (2007). Cluster variation method investigation of photoinduced charge transfer in YBa2Cu3O6+x material. in Physica. C: Superconductivity and Its Applications, 460, 364-365.
https://doi.org/10.1016/j.physc.2007.03.051

Milić MM, Lazarov NĐ, Matić VM. Cluster variation method investigation of photoinduced charge transfer in YBa2Cu3O6+x material. in Physica. C: Superconductivity and Its Applications. 2007;460:364-365.
doi:10.1016/j.physc.2007.03.051 .

Milić, Mirjana M., Lazarov, Nenad Đ., Matić, Vladimir M., "Cluster variation method investigation of photoinduced charge transfer in YBa2Cu3O6+x material" in Physica. C: Superconductivity and Its Applications, 460 (2007):364-365,
https://doi.org/10.1016/j.physc.2007.03.051 . .

TY  - JOUR
AU  - Matić, Vladimir M.
AU  - Lazarov, Nenad Đ.
PY  - 2006
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3061
AB  - Statistics of CuO chains in basal planes of YBa2Cu3O6+x high-T-c superconductor has been studied in terms of two dimensional asymmetric next-to-nearest-neighbor Ising (ASYNNNI) model, with accentuation on distribution of CuO, chains per different chain lengths. It has been shown that the fraction p(1) of CuO chains containing l oxygen ions (i.e., having the length equal to l), satisfies so-called law of geometric distribution p(l) = w(1-w)(l-1), where the quantity w is equal to the inverse of average chain length l(av) in the system, for given values of oxygen content x and temperature T. In the case of ortho-II (OII) structural phase, the geometric chain probability distribution is shown to hold separately for each of two different sublattices of oxygen sites, commonly known as alpha(1), and alpha(2), with respectively defined l(av)(alpha 1)(x, T) and l(av)(alpha 2)(x, T). The theoretically derived result of the chain probability distribution p(l) is shown to be in a remarkable agreement with the results obtained out of extensive Monte Carlo calculations that were made within region of stability of orthorhombic structural phases in (x, 7) space. The relevance of chain length distribution for accurate count of the number of transferred electronic holes to superconducting CuO2 layers has been pointed out and expression for hole concentration has been derived. The concept of critical chain length for charge transfer mechanism was briefly discussed. (c) 2006 Elsevier B.V. All rights reserved.
T2  - Physica. C: Superconductivity and Its Applications
T1  - Geometric distribution of CuO chains in YBa2Cu3O6+x
VL  - 443
IS  - 1-2
SP  - 49
EP  - 56
DO  - 10.1016/j.physc.2006.04.094
ER  - 

@article{
author = "Matić, Vladimir M. and Lazarov, Nenad Đ.",
year = "2006",
abstract = "Statistics of CuO chains in basal planes of YBa2Cu3O6+x high-T-c superconductor has been studied in terms of two dimensional asymmetric next-to-nearest-neighbor Ising (ASYNNNI) model, with accentuation on distribution of CuO, chains per different chain lengths. It has been shown that the fraction p(1) of CuO chains containing l oxygen ions (i.e., having the length equal to l), satisfies so-called law of geometric distribution p(l) = w(1-w)(l-1), where the quantity w is equal to the inverse of average chain length l(av) in the system, for given values of oxygen content x and temperature T. In the case of ortho-II (OII) structural phase, the geometric chain probability distribution is shown to hold separately for each of two different sublattices of oxygen sites, commonly known as alpha(1), and alpha(2), with respectively defined l(av)(alpha 1)(x, T) and l(av)(alpha 2)(x, T). The theoretically derived result of the chain probability distribution p(l) is shown to be in a remarkable agreement with the results obtained out of extensive Monte Carlo calculations that were made within region of stability of orthorhombic structural phases in (x, 7) space. The relevance of chain length distribution for accurate count of the number of transferred electronic holes to superconducting CuO2 layers has been pointed out and expression for hole concentration has been derived. The concept of critical chain length for charge transfer mechanism was briefly discussed. (c) 2006 Elsevier B.V. All rights reserved.",
journal = "Physica. C: Superconductivity and Its Applications",
title = "Geometric distribution of CuO chains in YBa2Cu3O6+x",
volume = "443",
number = "1-2",
pages = "49-56",
doi = "10.1016/j.physc.2006.04.094"
}

Matić, V. M.,& Lazarov, N. Đ.. (2006). Geometric distribution of CuO chains in YBa2Cu3O6+x. in Physica. C: Superconductivity and Its Applications, 443(1-2), 49-56.
https://doi.org/10.1016/j.physc.2006.04.094

Matić VM, Lazarov NĐ. Geometric distribution of CuO chains in YBa2Cu3O6+x. in Physica. C: Superconductivity and Its Applications. 2006;443(1-2):49-56.
doi:10.1016/j.physc.2006.04.094 .

Matić, Vladimir M., Lazarov, Nenad Đ., "Geometric distribution of CuO chains in YBa2Cu3O6+x" in Physica. C: Superconductivity and Its Applications, 443, no. 1-2 (2006):49-56,
https://doi.org/10.1016/j.physc.2006.04.094 . .

TY  - CONF
AU  - Milić, Mirjana M.
AU  - Matić, Vladimir M.
AU  - Lazarov, Nenad Đ.
PY  - 2006
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9458
AB  - The number of positive holes transferred from the CuOx basal planes to the superconducting CuO2 planes of YBa2Cu3O6+x material was calculated as a function of oxygen content x, by the use of numerical cluster variation method (CVM). The calculations were performed for the set of three different temperatures and for the different values of the parameter ξl which represents the ratio of the number m of divalent oxygen ions in the chain fragment and the total number l of oxygen ions in the chain fragment. The obtained hole count versus x dependence showed no plateau behavior for low temperatures (t=0.25 and t=0.35) while for t=0.45 indication of plateau behavior is present.
PB  - Society of Physical Chemists of Serbia
C3  - Physical chemistry 2006: 8th international conference on fundemental and applied aspract of physical chemistry
T1  - Cvm study of charge transfer in YBa2Cu3O6+x material
SP  - 570
EP  - 572
UR  - https://hdl.handle.net/21.15107/rcub_vinar_9458
ER  - 

@conference{
author = "Milić, Mirjana M. and Matić, Vladimir M. and Lazarov, Nenad Đ.",
year = "2006",
abstract = "The number of positive holes transferred from the CuOx basal planes to the superconducting CuO2 planes of YBa2Cu3O6+x material was calculated as a function of oxygen content x, by the use of numerical cluster variation method (CVM). The calculations were performed for the set of three different temperatures and for the different values of the parameter ξl which represents the ratio of the number m of divalent oxygen ions in the chain fragment and the total number l of oxygen ions in the chain fragment. The obtained hole count versus x dependence showed no plateau behavior for low temperatures (t=0.25 and t=0.35) while for t=0.45 indication of plateau behavior is present.",
publisher = "Society of Physical Chemists of Serbia",
journal = "Physical chemistry 2006: 8th international conference on fundemental and applied aspract of physical chemistry",
title = "Cvm study of charge transfer in YBa2Cu3O6+x material",
pages = "570-572",
url = "https://hdl.handle.net/21.15107/rcub_vinar_9458"
}

Milić, M. M., Matić, V. M.,& Lazarov, N. Đ.. (2006). Cvm study of charge transfer in YBa2Cu3O6+x material. in Physical chemistry 2006: 8th international conference on fundemental and applied aspract of physical chemistry
Society of Physical Chemists of Serbia., 570-572.
https://hdl.handle.net/21.15107/rcub_vinar_9458

Milić MM, Matić VM, Lazarov NĐ. Cvm study of charge transfer in YBa2Cu3O6+x material. in Physical chemistry 2006: 8th international conference on fundemental and applied aspract of physical chemistry. 2006;:570-572.
https://hdl.handle.net/21.15107/rcub_vinar_9458 .

Milić, Mirjana M., Matić, Vladimir M., Lazarov, Nenad Đ., "Cvm study of charge transfer in YBa2Cu3O6+x material" in Physical chemistry 2006: 8th international conference on fundemental and applied aspract of physical chemistry (2006):570-572,
https://hdl.handle.net/21.15107/rcub_vinar_9458 .