TY  - JOUR
AU  - Jović Orsini, Nataša
AU  - Milić, Mirjana M.
AU  - Torres, Teobaldo E.
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8890
AB  - In this work, we studied structural and magnetic properties of 18 nm sized Zn-substituted magnetite, 28 nm sized unsubstituted and 17 nm sized (Mn, Zn)-substituted iron oxide nanoparticles, synthesized by thermal decomposition method. Their features were examined by analyzing the x-ray diffraction data, Fe-57 Mossbauer spectra and magnetization measurements by SQUID interferometer. The microstructure was inspected comparing the different size and strain broadening models incorporated into Fullprof software. In terms of crystallinity and size dispersion, applied synthesis protocol shows superiority over decomposition of iron oleate and the co-precipitation synthesis route. The saturation magnetization at T = 5 K was found to be within the M-S = 91.2-98.6 A m(2 )kg(-1) range, while at 300 K M-S of pure and Zn-substituted Fe3O4 nanoparticles is 83.6 and 86.2 A m(2 )kg(-1), respectively. Effective magnetic anisotropy constant K-eff, estimated under slow measurements by SQUID, is below 20 kJ m(-3) in all three samples. Some preliminary measurements of the magnetic hyperthermia performance, expressed via specific absorption rate value showed that the best heating performances were displayed by 18 nm sized oleic acid-coated Zn0.13Fe2.87O4 cubo-octahedrons with SAR approximately equal to 425 W/g(Fe) at H-0 = 20 kA m(-1) and f = 228 kHz.
T2  - Nanotechnology
T1  - Zn- and (Mn, Zn)-substituted versus unsubstituted magnetite nanoparticles: structural, magnetic and hyperthermic properties
VL  - 31
IS  - 22
SP  - 225707
DO  - 10.1088/1361-6528/ab76e7
ER  - 

@article{
author = "Jović Orsini, Nataša and Milić, Mirjana M. and Torres, Teobaldo E.",
year = "2020",
abstract = "In this work, we studied structural and magnetic properties of 18 nm sized Zn-substituted magnetite, 28 nm sized unsubstituted and 17 nm sized (Mn, Zn)-substituted iron oxide nanoparticles, synthesized by thermal decomposition method. Their features were examined by analyzing the x-ray diffraction data, Fe-57 Mossbauer spectra and magnetization measurements by SQUID interferometer. The microstructure was inspected comparing the different size and strain broadening models incorporated into Fullprof software. In terms of crystallinity and size dispersion, applied synthesis protocol shows superiority over decomposition of iron oleate and the co-precipitation synthesis route. The saturation magnetization at T = 5 K was found to be within the M-S = 91.2-98.6 A m(2 )kg(-1) range, while at 300 K M-S of pure and Zn-substituted Fe3O4 nanoparticles is 83.6 and 86.2 A m(2 )kg(-1), respectively. Effective magnetic anisotropy constant K-eff, estimated under slow measurements by SQUID, is below 20 kJ m(-3) in all three samples. Some preliminary measurements of the magnetic hyperthermia performance, expressed via specific absorption rate value showed that the best heating performances were displayed by 18 nm sized oleic acid-coated Zn0.13Fe2.87O4 cubo-octahedrons with SAR approximately equal to 425 W/g(Fe) at H-0 = 20 kA m(-1) and f = 228 kHz.",
journal = "Nanotechnology",
title = "Zn- and (Mn, Zn)-substituted versus unsubstituted magnetite nanoparticles: structural, magnetic and hyperthermic properties",
volume = "31",
number = "22",
pages = "225707",
doi = "10.1088/1361-6528/ab76e7"
}

Jović Orsini, N., Milić, M. M.,& Torres, T. E.. (2020). Zn- and (Mn, Zn)-substituted versus unsubstituted magnetite nanoparticles: structural, magnetic and hyperthermic properties. in Nanotechnology, 31(22), 225707.
https://doi.org/10.1088/1361-6528/ab76e7

Jović Orsini N, Milić MM, Torres TE. Zn- and (Mn, Zn)-substituted versus unsubstituted magnetite nanoparticles: structural, magnetic and hyperthermic properties. in Nanotechnology. 2020;31(22):225707.
doi:10.1088/1361-6528/ab76e7 .

Jović Orsini, Nataša, Milić, Mirjana M., Torres, Teobaldo E., "Zn- and (Mn, Zn)-substituted versus unsubstituted magnetite nanoparticles: structural, magnetic and hyperthermic properties" in Nanotechnology, 31, no. 22 (2020):225707,
https://doi.org/10.1088/1361-6528/ab76e7 . .

TY  - JOUR
AU  - Bradarić, Ivica
AU  - Matić, Vladimir M.
AU  - Savić, Ilija
AU  - Rakočević, Zlatko Lj.
AU  - Popović, Maja
AU  - Destraz, Daniel
AU  - Keller, Hugo
PY  - 2018
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7907
AB  - Calcium ruthenate (CaRuO3) is widely believed to be located close to a quantum critical point due to the strong non-Fermi-liquid behavior expressed in the temperature dependence of electronic transport, specific heat, optical conductivity, etc. However, the corresponding anomalous behavior, marking crossover temperature regimes in the magnetic response of CaRuO3, is still lacking. Here we report detailed AC and DC magnetic susceptibility measurements of CaRuO3 and CaR u0.97 Ti 0.03 O3. The AC magnetic susceptibility measurements of CaRuO3 show a slight dependence on the frequency of AC magnetic field below ∼40K, and an additional subtle change of curvature around 12 K. We interpret these results as a critical slowing down of spin fluctuations towards T = 0 K. We confirm these observations by magnetic measurements of CaRu0.97 Ti 0.03 O3, which show a pronounced magnetic response corresponding to the above temperatures.
T2  - Physical Review B
T1  - Anomalous magnetic properties of CaRuO3 probed by AC and DC magnetic measurements and by low Ti impurity doping
VL  - 98
IS  - 13
SP  - 134436
DO  - 10.1103/PhysRevB.98.134436
ER  - 

@article{
author = "Bradarić, Ivica and Matić, Vladimir M. and Savić, Ilija and Rakočević, Zlatko Lj. and Popović, Maja and Destraz, Daniel and Keller, Hugo",
year = "2018",
abstract = "Calcium ruthenate (CaRuO3) is widely believed to be located close to a quantum critical point due to the strong non-Fermi-liquid behavior expressed in the temperature dependence of electronic transport, specific heat, optical conductivity, etc. However, the corresponding anomalous behavior, marking crossover temperature regimes in the magnetic response of CaRuO3, is still lacking. Here we report detailed AC and DC magnetic susceptibility measurements of CaRuO3 and CaR u0.97 Ti 0.03 O3. The AC magnetic susceptibility measurements of CaRuO3 show a slight dependence on the frequency of AC magnetic field below ∼40K, and an additional subtle change of curvature around 12 K. We interpret these results as a critical slowing down of spin fluctuations towards T = 0 K. We confirm these observations by magnetic measurements of CaRu0.97 Ti 0.03 O3, which show a pronounced magnetic response corresponding to the above temperatures.",
journal = "Physical Review B",
title = "Anomalous magnetic properties of CaRuO3 probed by AC and DC magnetic measurements and by low Ti impurity doping",
volume = "98",
number = "13",
pages = "134436",
doi = "10.1103/PhysRevB.98.134436"
}

Bradarić, I., Matić, V. M., Savić, I., Rakočević, Z. Lj., Popović, M., Destraz, D.,& Keller, H.. (2018). Anomalous magnetic properties of CaRuO3 probed by AC and DC magnetic measurements and by low Ti impurity doping. in Physical Review B, 98(13), 134436.
https://doi.org/10.1103/PhysRevB.98.134436

Bradarić I, Matić VM, Savić I, Rakočević ZL, Popović M, Destraz D, Keller H. Anomalous magnetic properties of CaRuO3 probed by AC and DC magnetic measurements and by low Ti impurity doping. in Physical Review B. 2018;98(13):134436.
doi:10.1103/PhysRevB.98.134436 .

Bradarić, Ivica, Matić, Vladimir M., Savić, Ilija, Rakočević, Zlatko Lj., Popović, Maja, Destraz, Daniel, Keller, Hugo, "Anomalous magnetic properties of CaRuO3 probed by AC and DC magnetic measurements and by low Ti impurity doping" in Physical Review B, 98, no. 13 (2018):134436,
https://doi.org/10.1103/PhysRevB.98.134436 . .

TY  - JOUR
AU  - Bradarić, Ivica
AU  - Matić, Vladimir M.
AU  - Savić, Ilija
AU  - Rakočević, Zlatko Lj.
AU  - Popović, Maja
AU  - Destraz, Daniel
AU  - Keller, Hugo
PY  - 2018
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7908
UR  - https://arxiv.org/abs/1712.04471
AB  - Calcium ruthenate (CaRuO3) is widely believed to be located close to a quantum critical point due to the strong non-Fermi-liquid behavior expressed in the temperature dependence of electronic transport, specific heat, optical conductivity, etc. However, the corresponding anomalous behavior, marking crossover temperature regimes in the magnetic response of CaRuO3, is still lacking. Here we report detailed AC and DC magnetic susceptibility measurements of CaRuO3 and CaR u0.97 Ti 0.03 O3. The AC magnetic susceptibility measurements of CaRuO3 show a slight dependence on the frequency of AC magnetic field below ∼40K, and an additional subtle change of curvature around 12 K. We interpret these results as a critical slowing down of spin fluctuations towards T = 0 K. We confirm these observations by magnetic measurements of CaRu0.97 Ti 0.03 O3, which show a pronounced magnetic response corresponding to the above temperatures.
T2  - Physical Review B
T1  - Anomalous magnetic properties of CaRuO3 probed by AC and DC magnetic measurements and by low Ti impurity doping
VL  - 98
IS  - 13
SP  - 134436
DO  - 10.1103/PhysRevB.98.134436
ER  - 

@article{
author = "Bradarić, Ivica and Matić, Vladimir M. and Savić, Ilija and Rakočević, Zlatko Lj. and Popović, Maja and Destraz, Daniel and Keller, Hugo",
year = "2018",
abstract = "Calcium ruthenate (CaRuO3) is widely believed to be located close to a quantum critical point due to the strong non-Fermi-liquid behavior expressed in the temperature dependence of electronic transport, specific heat, optical conductivity, etc. However, the corresponding anomalous behavior, marking crossover temperature regimes in the magnetic response of CaRuO3, is still lacking. Here we report detailed AC and DC magnetic susceptibility measurements of CaRuO3 and CaR u0.97 Ti 0.03 O3. The AC magnetic susceptibility measurements of CaRuO3 show a slight dependence on the frequency of AC magnetic field below ∼40K, and an additional subtle change of curvature around 12 K. We interpret these results as a critical slowing down of spin fluctuations towards T = 0 K. We confirm these observations by magnetic measurements of CaRu0.97 Ti 0.03 O3, which show a pronounced magnetic response corresponding to the above temperatures.",
journal = "Physical Review B",
title = "Anomalous magnetic properties of CaRuO3 probed by AC and DC magnetic measurements and by low Ti impurity doping",
volume = "98",
number = "13",
pages = "134436",
doi = "10.1103/PhysRevB.98.134436"
}

Bradarić, I., Matić, V. M., Savić, I., Rakočević, Z. Lj., Popović, M., Destraz, D.,& Keller, H.. (2018). Anomalous magnetic properties of CaRuO3 probed by AC and DC magnetic measurements and by low Ti impurity doping. in Physical Review B, 98(13), 134436.
https://doi.org/10.1103/PhysRevB.98.134436

Bradarić I, Matić VM, Savić I, Rakočević ZL, Popović M, Destraz D, Keller H. Anomalous magnetic properties of CaRuO3 probed by AC and DC magnetic measurements and by low Ti impurity doping. in Physical Review B. 2018;98(13):134436.
doi:10.1103/PhysRevB.98.134436 .

Bradarić, Ivica, Matić, Vladimir M., Savić, Ilija, Rakočević, Zlatko Lj., Popović, Maja, Destraz, Daniel, Keller, Hugo, "Anomalous magnetic properties of CaRuO3 probed by AC and DC magnetic measurements and by low Ti impurity doping" in Physical Review B, 98, no. 13 (2018):134436,
https://doi.org/10.1103/PhysRevB.98.134436 . .

TY  - JOUR
AU  - Milić, Mirjana M.
AU  - Nikolić, Violeta N.
AU  - Jovanović, Sonja
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1735
AB  - In this work, sol gel method was used to prepare FexOy/Gd2O3/SiO2 composite system starting from two different iron precursors: iron nitrate and iron oxide xerogel. The obtained samples were subjected to heat treatment at different temperatures under atmospheric conditions. Thermal evolution of the prepared samples has been systematically investigated by using X-ray diffraction (XRD) analysis and Fourier transform infrared spectroscopy (FTIR). Samples calcined at 1030 degrees C were also characterized by transmission electron microscopy (TEM) and vibrating sample magnetometer (VSM) experimental techniques. Effect of thermal treatment on phase formation in the prepared composite system has been discussed. It was found that iron nitrate based sample developed only alpha-Fe2O3 structural phase, while the sample based on the iron oxide xerogel developed alpha-Fe2O3 and gamma-Fe2O3 phases, with both of them remaining stable up to temperatures as high as 1030 degrees C. Gadolinium precursor crystallized directly in low-temperature triclinic B-type gadolinium disilicate Gd2Si2O7 (Gd2O3 center dot 2SiO(2)) phase at 900 degrees C, without formation of intermediate monosilicate phase. No other crystalline phases related to gadolinium were observed.
T2  - Ceramics International
T1  - Synthesis and characterization of nanocrystalline FexOy/Gd2O3/SiO2 composite powder
VL  - 43
IS  - 16
SP  - 14044
EP  - 14049
DO  - 10.1016/j.ceramint.2017.07.138
ER  - 

@article{
author = "Milić, Mirjana M. and Nikolić, Violeta N. and Jovanović, Sonja",
year = "2017",
abstract = "In this work, sol gel method was used to prepare FexOy/Gd2O3/SiO2 composite system starting from two different iron precursors: iron nitrate and iron oxide xerogel. The obtained samples were subjected to heat treatment at different temperatures under atmospheric conditions. Thermal evolution of the prepared samples has been systematically investigated by using X-ray diffraction (XRD) analysis and Fourier transform infrared spectroscopy (FTIR). Samples calcined at 1030 degrees C were also characterized by transmission electron microscopy (TEM) and vibrating sample magnetometer (VSM) experimental techniques. Effect of thermal treatment on phase formation in the prepared composite system has been discussed. It was found that iron nitrate based sample developed only alpha-Fe2O3 structural phase, while the sample based on the iron oxide xerogel developed alpha-Fe2O3 and gamma-Fe2O3 phases, with both of them remaining stable up to temperatures as high as 1030 degrees C. Gadolinium precursor crystallized directly in low-temperature triclinic B-type gadolinium disilicate Gd2Si2O7 (Gd2O3 center dot 2SiO(2)) phase at 900 degrees C, without formation of intermediate monosilicate phase. No other crystalline phases related to gadolinium were observed.",
journal = "Ceramics International",
title = "Synthesis and characterization of nanocrystalline FexOy/Gd2O3/SiO2 composite powder",
volume = "43",
number = "16",
pages = "14044-14049",
doi = "10.1016/j.ceramint.2017.07.138"
}

Milić, M. M., Nikolić, V. N.,& Jovanović, S.. (2017). Synthesis and characterization of nanocrystalline FexOy/Gd2O3/SiO2 composite powder. in Ceramics International, 43(16), 14044-14049.
https://doi.org/10.1016/j.ceramint.2017.07.138

Milić MM, Nikolić VN, Jovanović S. Synthesis and characterization of nanocrystalline FexOy/Gd2O3/SiO2 composite powder. in Ceramics International. 2017;43(16):14044-14049.
doi:10.1016/j.ceramint.2017.07.138 .

Milić, Mirjana M., Nikolić, Violeta N., Jovanović, Sonja, "Synthesis and characterization of nanocrystalline FexOy/Gd2O3/SiO2 composite powder" in Ceramics International, 43, no. 16 (2017):14044-14049,
https://doi.org/10.1016/j.ceramint.2017.07.138 . .

TY  - JOUR
AU  - Nikolić, Violeta N.
AU  - Milić, Mirjana
AU  - Jovanović, Sonja
AU  - Girman, Vladimir
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10288
AB  - Monodisperse samples of magnetite nanoparticles in the size range of 5-13nm, were prepared by solvothermal synthesis and coprecipitation method. Obtained nanoparticles were characterized by different measurement techniques: X-ray diffraction analysis, transmission electron microscopy, selected area electron diffraction measurement, and Fourier transform infra-red spectroscopy. Measurements confirmed that the utilized synthesis methods are able to produce size and shape-controlled nanoparticles of a high-quality, that is of the technological importance. The results of the performed study represent the first stage in preparation of the Fe3O4 nanoparticles as an additive to concrete, which will be used for the construction of the special military facilities where it is necessary to provide a protection against γ-ray radiation.
T2  - Scientific Technical Review
T1  - Fe3O4 nanoparticles as additives for gamma-ray shielding: Structural and surface characterization
VL  - 67
IS  - 2
SP  - 20
EP  - 26
DO  - 10.5937/str1702020N
ER  - 

@article{
author = "Nikolić, Violeta N. and Milić, Mirjana and Jovanović, Sonja and Girman, Vladimir",
year = "2017",
abstract = "Monodisperse samples of magnetite nanoparticles in the size range of 5-13nm, were prepared by solvothermal synthesis and coprecipitation method. Obtained nanoparticles were characterized by different measurement techniques: X-ray diffraction analysis, transmission electron microscopy, selected area electron diffraction measurement, and Fourier transform infra-red spectroscopy. Measurements confirmed that the utilized synthesis methods are able to produce size and shape-controlled nanoparticles of a high-quality, that is of the technological importance. The results of the performed study represent the first stage in preparation of the Fe3O4 nanoparticles as an additive to concrete, which will be used for the construction of the special military facilities where it is necessary to provide a protection against γ-ray radiation.",
journal = "Scientific Technical Review",
title = "Fe3O4 nanoparticles as additives for gamma-ray shielding: Structural and surface characterization",
volume = "67",
number = "2",
pages = "20-26",
doi = "10.5937/str1702020N"
}

Nikolić, V. N., Milić, M., Jovanović, S.,& Girman, V.. (2017). Fe3O4 nanoparticles as additives for gamma-ray shielding: Structural and surface characterization. in Scientific Technical Review, 67(2), 20-26.
https://doi.org/10.5937/str1702020N

Nikolić VN, Milić M, Jovanović S, Girman V. Fe3O4 nanoparticles as additives for gamma-ray shielding: Structural and surface characterization. in Scientific Technical Review. 2017;67(2):20-26.
doi:10.5937/str1702020N .

Nikolić, Violeta N., Milić, Mirjana, Jovanović, Sonja, Girman, Vladimir, "Fe3O4 nanoparticles as additives for gamma-ray shielding: Structural and surface characterization" in Scientific Technical Review, 67, no. 2 (2017):20-26,
https://doi.org/10.5937/str1702020N . .

TY  - CONF
AU  - Milić, Mirjana M.
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9218
AB  - Conducting properties of REBa2Cu3O6+x(RE123) type high Tc
superconductors (RE=Y, 4f elements) are highly sensitive to the oxygen
order in the oxygen deficient CuOx planes which can be disrupted by doping
with different metals,thus leading to a change of the superconducting
transition temperature Tc. In this article we shall employ a simple theoretical
model of charge transfer to studyhow Tc(x) dependence is affected by the
increase of oxygen disorder in the CuOx planes, which is displayed in
reduced average CuO chain length, lav. The results indicate that though the
increased oxygen disorder can produce significant decrease in Tc, it cannot
be the only factor responsible forTc reduction in Zn doped RE123
superconductors.
PB  - Society of Physical Chemists of Serbia
C3  - Physical chemistry 2014: 12th International Conference on Fundamental and Applied Aspects of Physical Chemistry
T1  - Impact of oxygen disorder on Tc supression in Zn dopedreba2Cu3O6+x superocnductors
VL  - I-02-O
UR  - https://hdl.handle.net/21.15107/rcub_vinar_9218
ER  - 

@conference{
author = "Milić, Mirjana M.",
year = "2014",
abstract = "Conducting properties of REBa2Cu3O6+x(RE123) type high Tc
superconductors (RE=Y, 4f elements) are highly sensitive to the oxygen
order in the oxygen deficient CuOx planes which can be disrupted by doping
with different metals,thus leading to a change of the superconducting
transition temperature Tc. In this article we shall employ a simple theoretical
model of charge transfer to studyhow Tc(x) dependence is affected by the
increase of oxygen disorder in the CuOx planes, which is displayed in
reduced average CuO chain length, lav. The results indicate that though the
increased oxygen disorder can produce significant decrease in Tc, it cannot
be the only factor responsible forTc reduction in Zn doped RE123
superconductors.",
publisher = "Society of Physical Chemists of Serbia",
journal = "Physical chemistry 2014: 12th International Conference on Fundamental and Applied Aspects of Physical Chemistry",
title = "Impact of oxygen disorder on Tc supression in Zn dopedreba2Cu3O6+x superocnductors",
volume = "I-02-O",
url = "https://hdl.handle.net/21.15107/rcub_vinar_9218"
}

Milić, M. M.. (2014). Impact of oxygen disorder on Tc supression in Zn dopedreba2Cu3O6+x superocnductors. in Physical chemistry 2014: 12th International Conference on Fundamental and Applied Aspects of Physical Chemistry
Society of Physical Chemists of Serbia., I-02-O.
https://hdl.handle.net/21.15107/rcub_vinar_9218

Milić MM. Impact of oxygen disorder on Tc supression in Zn dopedreba2Cu3O6+x superocnductors. in Physical chemistry 2014: 12th International Conference on Fundamental and Applied Aspects of Physical Chemistry. 2014;I-02-O.
https://hdl.handle.net/21.15107/rcub_vinar_9218 .

Milić, Mirjana M., "Impact of oxygen disorder on Tc supression in Zn dopedreba2Cu3O6+x superocnductors" in Physical chemistry 2014: 12th International Conference on Fundamental and Applied Aspects of Physical Chemistry, I-02-O (2014),
https://hdl.handle.net/21.15107/rcub_vinar_9218 .

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  - Milić, Mirjana M.
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5254
AB  - Experimental results available in the literature were employed to study the high pressure dependence of the superconducting transition temperature T (c) of YBa2Cu3O (x) high-T (c) superconductor in a wide range of oxygen concentrations x. By the use of simple phenomenological model, we determined the T (c) (x) dependences at different constant values of pressure P to 35 GPa. We found that maximum T (c) which can be attained in YBa2Cu3O (x) material is approximately 131 K, and it is achieved for Pa parts per thousand 18 GPa in the sample with xa parts per thousand 6.74 and with zero pressure hole concentration n (h,0)a parts per thousand 0.11.
T2  - Journal of Low Temperature Physics
T1  - Study on the Pressure Effect in YBa2Cu3Ox as a Function Oxygen Content x
VL  - 170
IS  - 3-4
SP  - 152
EP  - 159
DO  - 10.1007/s10909-012-0774-5
ER  - 

@article{
author = "Milić, Mirjana M.",
year = "2013",
abstract = "Experimental results available in the literature were employed to study the high pressure dependence of the superconducting transition temperature T (c) of YBa2Cu3O (x) high-T (c) superconductor in a wide range of oxygen concentrations x. By the use of simple phenomenological model, we determined the T (c) (x) dependences at different constant values of pressure P to 35 GPa. We found that maximum T (c) which can be attained in YBa2Cu3O (x) material is approximately 131 K, and it is achieved for Pa parts per thousand 18 GPa in the sample with xa parts per thousand 6.74 and with zero pressure hole concentration n (h,0)a parts per thousand 0.11.",
journal = "Journal of Low Temperature Physics",
title = "Study on the Pressure Effect in YBa2Cu3Ox as a Function Oxygen Content x",
volume = "170",
number = "3-4",
pages = "152-159",
doi = "10.1007/s10909-012-0774-5"
}

Milić, M. M.. (2013). Study on the Pressure Effect in YBa2Cu3Ox as a Function Oxygen Content x. in Journal of Low Temperature Physics, 170(3-4), 152-159.
https://doi.org/10.1007/s10909-012-0774-5

Milić MM. Study on the Pressure Effect in YBa2Cu3Ox as a Function Oxygen Content x. in Journal of Low Temperature Physics. 2013;170(3-4):152-159.
doi:10.1007/s10909-012-0774-5 .

Milić, Mirjana M., "Study on the Pressure Effect in YBa2Cu3Ox as a Function Oxygen Content x" in Journal of Low Temperature Physics, 170, no. 3-4 (2013):152-159,
https://doi.org/10.1007/s10909-012-0774-5 . .

TY  - JOUR
AU  - Milić, Mirjana M.
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5439
AB  - Pressure effect on the critical temperature, T-c, of the YBa2Cu3Ox superconductor was considered in the frame of a simple theoretical model which as a starting point assumes that T-c vs. pressure, P, dependence can be described by an inverted parabola. Available experimental results on T-c behavior under pressure were analyzed as a function of the zero pressure hole concentration in the superconducting CuO2 planes, n(h)(P = 0 GPa)= n(h0), for different constant values of P. Maximum T-c that can be achieved under pressure was estimated and discussed in relation to the n(h0) = 1/8 doping and establishment of charge and spin order. The results obtained here were used to estimate increase of the hole concentration in the CuO2 planes which occurs as a result of pressure induced oxygen reordering.
T2  - Acta Physica Polonica A
T1  - Theoretical Study on the Pressure Induced T-c Change in YBa2Cu3Ox
VL  - 124
IS  - 4
SP  - 745
EP  - 749
UR  - https://hdl.handle.net/21.15107/rcub_vinar_5439
ER  - 

@article{
author = "Milić, Mirjana M.",
year = "2013",
abstract = "Pressure effect on the critical temperature, T-c, of the YBa2Cu3Ox superconductor was considered in the frame of a simple theoretical model which as a starting point assumes that T-c vs. pressure, P, dependence can be described by an inverted parabola. Available experimental results on T-c behavior under pressure were analyzed as a function of the zero pressure hole concentration in the superconducting CuO2 planes, n(h)(P = 0 GPa)= n(h0), for different constant values of P. Maximum T-c that can be achieved under pressure was estimated and discussed in relation to the n(h0) = 1/8 doping and establishment of charge and spin order. The results obtained here were used to estimate increase of the hole concentration in the CuO2 planes which occurs as a result of pressure induced oxygen reordering.",
journal = "Acta Physica Polonica A",
title = "Theoretical Study on the Pressure Induced T-c Change in YBa2Cu3Ox",
volume = "124",
number = "4",
pages = "745-749",
url = "https://hdl.handle.net/21.15107/rcub_vinar_5439"
}

Milić, M. M.. (2013). Theoretical Study on the Pressure Induced T-c Change in YBa2Cu3Ox. in Acta Physica Polonica A, 124(4), 745-749.
https://hdl.handle.net/21.15107/rcub_vinar_5439

Milić MM. Theoretical Study on the Pressure Induced T-c Change in YBa2Cu3Ox. in Acta Physica Polonica A. 2013;124(4):745-749.
https://hdl.handle.net/21.15107/rcub_vinar_5439 .

Milić, Mirjana M., "Theoretical Study on the Pressure Induced T-c Change in YBa2Cu3Ox" in Acta Physica Polonica A, 124, no. 4 (2013):745-749,
https://hdl.handle.net/21.15107/rcub_vinar_5439 .

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.
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4350
AB  - The model of photoassisted oxygen ordering assumes that the enhancement of the conducting properties of RBa2Cu3O6+x material during the light illumination, is the consequence of the CuOx plane oxygen atoms reordering into long chain fragments, which are known to be better hole dopants than the short ones. Some experimental results suggest that this process is performed mainly through the reaccomodation of the oxygen monomer units (isolated oxygen ions). In the present work concentration of oxygen monomers in the CuOx planes, which is assumed to be equal to the concentration of holes transferred out of the chain planes during the light illumination, is calculated as a function of oxygen content x, and delta T-c (photoinduced enhancement of the superconducting critical temperature T-c) was estimated for different oxygen concentrations. Numerically found values of the (delta T-c, are shown to be in good agreement with experimental findings. (C) 2011 Elsevier Ltd. All rights reserved.
T2  - Journal of Physics and Chemistry of Solids
T1  - Possible role of oxygen monomers reordering in the photoinduced charge transfer in RBa2Cu3O6+x material
VL  - 73
IS  - 1
SP  - 99
EP  - 103
DO  - 10.1016/j.jpcs.2011.10.010
ER  - 

@article{
author = "Milić, Mirjana M.",
year = "2012",
abstract = "The model of photoassisted oxygen ordering assumes that the enhancement of the conducting properties of RBa2Cu3O6+x material during the light illumination, is the consequence of the CuOx plane oxygen atoms reordering into long chain fragments, which are known to be better hole dopants than the short ones. Some experimental results suggest that this process is performed mainly through the reaccomodation of the oxygen monomer units (isolated oxygen ions). In the present work concentration of oxygen monomers in the CuOx planes, which is assumed to be equal to the concentration of holes transferred out of the chain planes during the light illumination, is calculated as a function of oxygen content x, and delta T-c (photoinduced enhancement of the superconducting critical temperature T-c) was estimated for different oxygen concentrations. Numerically found values of the (delta T-c, are shown to be in good agreement with experimental findings. (C) 2011 Elsevier Ltd. All rights reserved.",
journal = "Journal of Physics and Chemistry of Solids",
title = "Possible role of oxygen monomers reordering in the photoinduced charge transfer in RBa2Cu3O6+x material",
volume = "73",
number = "1",
pages = "99-103",
doi = "10.1016/j.jpcs.2011.10.010"
}

Milić, M. M.. (2012). Possible role of oxygen monomers reordering in the photoinduced charge transfer in RBa2Cu3O6+x material. in Journal of Physics and Chemistry of Solids, 73(1), 99-103.
https://doi.org/10.1016/j.jpcs.2011.10.010

Milić MM. Possible role of oxygen monomers reordering in the photoinduced charge transfer in RBa2Cu3O6+x material. in Journal of Physics and Chemistry of Solids. 2012;73(1):99-103.
doi:10.1016/j.jpcs.2011.10.010 .

Milić, Mirjana M., "Possible role of oxygen monomers reordering in the photoinduced charge transfer in RBa2Cu3O6+x material" in Journal of Physics and Chemistry of Solids, 73, no. 1 (2012):99-103,
https://doi.org/10.1016/j.jpcs.2011.10.010 . .