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  - CONF
AU  - Jugović, Dragana
AU  - Bradarić, Ivica
AU  - Jovalekić, Čedomir
AU  - Barudžija, Tanja
AU  - Kusigerski, Vladan
AU  - Mitrić, Miodrag
PY  - 2016
UR  - http://dais.sanu.ac.rs/123456789/897
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7554
AB  - Perovskite oxides with the composition LaFe1-xCrxO3 (x = 0.5 and 0.75) have been studied. The samples have been prepared using the mechanochemical treatment. A mixture of crystalline La(OH)3, Fe2O3 and Cr2O3 powders in stoichiometric ratio was mechanochemically treated in a planetary ball mill up to 40 h of milling. The mechanochemical formation of the LaFe1-xCrxO3 perovskite phase was followed by X-ray diffraction and magnetization measurements. The Rietveld refinement of the XRD data shows that the compounds crystallize in an orthorhombic perovskite structure with a random distribution of the Fe and Cr cations at the B sublattice. All structural and microstructural parameters were analyzed. In addition, magnetic measurements for LaFe0.5Cr0.5O3 show clear antiferromagnetic ordering bellow 250 K, which supports above conclusion of random distribution of Fe and Cr cations.
PB  - Belgrade : Materials Research Society of Serbia
C3  - YUCOMAT 2016 : 18th Annual Conference YUCOMAT 2016 : programme and the book of abstracts; September 5-10, Herceg Novi
T1  - Structural and magnetic properties of mechanochemically synthesized LaFe1-xCrxO3 (x = 0.5 and 0.75)
SP  - 57
EP  - 57
UR  - https://hdl.handle.net/21.15107/rcub_vinar_7554
ER  - 

@conference{
author = "Jugović, Dragana and Bradarić, Ivica and Jovalekić, Čedomir and Barudžija, Tanja and Kusigerski, Vladan and Mitrić, Miodrag",
year = "2016",
abstract = "Perovskite oxides with the composition LaFe1-xCrxO3 (x = 0.5 and 0.75) have been studied. The samples have been prepared using the mechanochemical treatment. A mixture of crystalline La(OH)3, Fe2O3 and Cr2O3 powders in stoichiometric ratio was mechanochemically treated in a planetary ball mill up to 40 h of milling. The mechanochemical formation of the LaFe1-xCrxO3 perovskite phase was followed by X-ray diffraction and magnetization measurements. The Rietveld refinement of the XRD data shows that the compounds crystallize in an orthorhombic perovskite structure with a random distribution of the Fe and Cr cations at the B sublattice. All structural and microstructural parameters were analyzed. In addition, magnetic measurements for LaFe0.5Cr0.5O3 show clear antiferromagnetic ordering bellow 250 K, which supports above conclusion of random distribution of Fe and Cr cations.",
publisher = "Belgrade : Materials Research Society of Serbia",
journal = "YUCOMAT 2016 : 18th Annual Conference YUCOMAT 2016 : programme and the book of abstracts; September 5-10, Herceg Novi",
title = "Structural and magnetic properties of mechanochemically synthesized LaFe1-xCrxO3 (x = 0.5 and 0.75)",
pages = "57-57",
url = "https://hdl.handle.net/21.15107/rcub_vinar_7554"
}

Jugović, D., Bradarić, I., Jovalekić, Č., Barudžija, T., Kusigerski, V.,& Mitrić, M.. (2016). Structural and magnetic properties of mechanochemically synthesized LaFe1-xCrxO3 (x = 0.5 and 0.75). in YUCOMAT 2016 : 18th Annual Conference YUCOMAT 2016 : programme and the book of abstracts; September 5-10, Herceg Novi
Belgrade : Materials Research Society of Serbia., 57-57.
https://hdl.handle.net/21.15107/rcub_vinar_7554

Jugović D, Bradarić I, Jovalekić Č, Barudžija T, Kusigerski V, Mitrić M. Structural and magnetic properties of mechanochemically synthesized LaFe1-xCrxO3 (x = 0.5 and 0.75). in YUCOMAT 2016 : 18th Annual Conference YUCOMAT 2016 : programme and the book of abstracts; September 5-10, Herceg Novi. 2016;:57-57.
https://hdl.handle.net/21.15107/rcub_vinar_7554 .

Jugović, Dragana, Bradarić, Ivica, Jovalekić, Čedomir, Barudžija, Tanja, Kusigerski, Vladan, Mitrić, Miodrag, "Structural and magnetic properties of mechanochemically synthesized LaFe1-xCrxO3 (x = 0.5 and 0.75)" in YUCOMAT 2016 : 18th Annual Conference YUCOMAT 2016 : programme and the book of abstracts; September 5-10, Herceg Novi (2016):57-57,
https://hdl.handle.net/21.15107/rcub_vinar_7554 .

TY  - JOUR
AU  - Baran, A.
AU  - Zorkovska, A.
AU  - Kajnakova, M.
AU  - Sebek, J.
AU  - Santava, E.
AU  - Bradarić, Ivica
AU  - Feher, A.
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4974
AB  - Thermodynamic and transport properties of the CaRu1xTixO3 system with x?=?0, 0.03, 0.07, 0.10, and 0.15 in magnetic field up to 9?T have been studied. The unconventional temperature dependences of magnetic susceptibility, specific heat, and electrical resistivity observed for CaRuO3 are typical for non-Fermi liquids and they support the assumption about the proximity of the system to the quantum critical point. The analysis of the experimental results suggests the electronic phase separation in CaRuO3 into ferromagnetic itinerant regions coexisting with strongly correlated ones. Substitution by titanium seems to push the system towards ferromagnetism, and drives it away from the quantum criticality.
T2  - Physica Status Solidi. B: Basic Solid State Physics
T1  - Quantum criticality in CaRuO3 - Influence of Ti substitution
VL  - 249
IS  - 8
SP  - 1607
EP  - 1612
DO  - 10.1002/pssb.201147575
ER  - 

@article{
author = "Baran, A. and Zorkovska, A. and Kajnakova, M. and Sebek, J. and Santava, E. and Bradarić, Ivica and Feher, A.",
year = "2012",
abstract = "Thermodynamic and transport properties of the CaRu1xTixO3 system with x?=?0, 0.03, 0.07, 0.10, and 0.15 in magnetic field up to 9?T have been studied. The unconventional temperature dependences of magnetic susceptibility, specific heat, and electrical resistivity observed for CaRuO3 are typical for non-Fermi liquids and they support the assumption about the proximity of the system to the quantum critical point. The analysis of the experimental results suggests the electronic phase separation in CaRuO3 into ferromagnetic itinerant regions coexisting with strongly correlated ones. Substitution by titanium seems to push the system towards ferromagnetism, and drives it away from the quantum criticality.",
journal = "Physica Status Solidi. B: Basic Solid State Physics",
title = "Quantum criticality in CaRuO3 - Influence of Ti substitution",
volume = "249",
number = "8",
pages = "1607-1612",
doi = "10.1002/pssb.201147575"
}

Baran, A., Zorkovska, A., Kajnakova, M., Sebek, J., Santava, E., Bradarić, I.,& Feher, A.. (2012). Quantum criticality in CaRuO3 - Influence of Ti substitution. in Physica Status Solidi. B: Basic Solid State Physics, 249(8), 1607-1612.
https://doi.org/10.1002/pssb.201147575

Baran A, Zorkovska A, Kajnakova M, Sebek J, Santava E, Bradarić I, Feher A. Quantum criticality in CaRuO3 - Influence of Ti substitution. in Physica Status Solidi. B: Basic Solid State Physics. 2012;249(8):1607-1612.
doi:10.1002/pssb.201147575 .

Baran, A., Zorkovska, A., Kajnakova, M., Sebek, J., Santava, E., Bradarić, Ivica, Feher, A., "Quantum criticality in CaRuO3 - Influence of Ti substitution" in Physica Status Solidi. B: Basic Solid State Physics, 249, no. 8 (2012):1607-1612,
https://doi.org/10.1002/pssb.201147575 . .

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  - Laad, M. S.
AU  - Bradarić, Ivica
AU  - Kusmartsev, F. V.
PY  - 2008
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3376
AB  - We peruse various anomalous physical responses of the cubic (ferromagnetic SrRuO3 and paramagnetic CaRuO3) ruthenates, such as fractional power-law conductivity, anomalous Raman line shapes, and Hall currents. We show how these exciting power-law observations are naturally described within a new, local (orbital) non-Fermi-liquid state arising from strong, multiorbital Coulomb interactions. Introducing a multiorbital, correlated model treated within the dynamical mean-field theory, we also find two distinct relaxation rates for relaxation of transport in complete agreement with experiment.
T2  - Physical Review Letters
T1  - Orbital non-Fermi-liquid behavior in cubic ruthenates
VL  - 100
IS  - 9
DO  - 10.1103/PhysRevLett.100.096402
ER  - 

@article{
author = "Laad, M. S. and Bradarić, Ivica and Kusmartsev, F. V.",
year = "2008",
abstract = "We peruse various anomalous physical responses of the cubic (ferromagnetic SrRuO3 and paramagnetic CaRuO3) ruthenates, such as fractional power-law conductivity, anomalous Raman line shapes, and Hall currents. We show how these exciting power-law observations are naturally described within a new, local (orbital) non-Fermi-liquid state arising from strong, multiorbital Coulomb interactions. Introducing a multiorbital, correlated model treated within the dynamical mean-field theory, we also find two distinct relaxation rates for relaxation of transport in complete agreement with experiment.",
journal = "Physical Review Letters",
title = "Orbital non-Fermi-liquid behavior in cubic ruthenates",
volume = "100",
number = "9",
doi = "10.1103/PhysRevLett.100.096402"
}

Laad, M. S., Bradarić, I.,& Kusmartsev, F. V.. (2008). Orbital non-Fermi-liquid behavior in cubic ruthenates. in Physical Review Letters, 100(9).
https://doi.org/10.1103/PhysRevLett.100.096402

Laad MS, Bradarić I, Kusmartsev FV. Orbital non-Fermi-liquid behavior in cubic ruthenates. in Physical Review Letters. 2008;100(9).
doi:10.1103/PhysRevLett.100.096402 .

Laad, M. S., Bradarić, Ivica, Kusmartsev, F. V., "Orbital non-Fermi-liquid behavior in cubic ruthenates" in Physical Review Letters, 100, no. 9 (2008),
https://doi.org/10.1103/PhysRevLett.100.096402 . .

TY  - JOUR
AU  - Zorkovska, A.
AU  - Baran, A.
AU  - Feher, A.
AU  - Sebek, J.
AU  - Santava, E.
AU  - Bradarić, Ivica
PY  - 2008
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6715
AB  - Electrical resistance, transversal magnetoresistance and the Hall effect were studied on polycrystalline CaTixRu1-xO3 (x = 0, 0.07) samples using a conventional Quantum Design PPMS-9 equipment in the temperature range 2-300 K and magnetic field up to 9 T. Substantial differences were found between the two samples: (i) opposite to the metallic character of CaRuO3, the substituted sample has insulating-like electrical resistance; (ii) the magnetoresistance of the substituted sample changes the sign from negative to positive values with increasing temperature. The magnetoresistance of CaRuO3 is negative, the sign reversal is induced by magnetic field and only at temperatures below 15 K, such a behaviour is predicted for clustered systems; (iii) the Hall voltage in pure CaRuO3 also changes sign from negative to positive values above 35 K. This temperature coincides with the observed magnetic transition temperature, indicating that the magnetic state and the carrier character interrelate.
T2  - Acta Physica Polonica A
T1  - Magnetotransport properties of CaTixRu1-xO3 (x=0, 0.07)
VL  - 113
IS  - 1
SP  - 351
EP  - 354
DO  - 10.12693/APhysPolA.113.351
ER  - 

@article{
author = "Zorkovska, A. and Baran, A. and Feher, A. and Sebek, J. and Santava, E. and Bradarić, Ivica",
year = "2008",
abstract = "Electrical resistance, transversal magnetoresistance and the Hall effect were studied on polycrystalline CaTixRu1-xO3 (x = 0, 0.07) samples using a conventional Quantum Design PPMS-9 equipment in the temperature range 2-300 K and magnetic field up to 9 T. Substantial differences were found between the two samples: (i) opposite to the metallic character of CaRuO3, the substituted sample has insulating-like electrical resistance; (ii) the magnetoresistance of the substituted sample changes the sign from negative to positive values with increasing temperature. The magnetoresistance of CaRuO3 is negative, the sign reversal is induced by magnetic field and only at temperatures below 15 K, such a behaviour is predicted for clustered systems; (iii) the Hall voltage in pure CaRuO3 also changes sign from negative to positive values above 35 K. This temperature coincides with the observed magnetic transition temperature, indicating that the magnetic state and the carrier character interrelate.",
journal = "Acta Physica Polonica A",
title = "Magnetotransport properties of CaTixRu1-xO3 (x=0, 0.07)",
volume = "113",
number = "1",
pages = "351-354",
doi = "10.12693/APhysPolA.113.351"
}

Zorkovska, A., Baran, A., Feher, A., Sebek, J., Santava, E.,& Bradarić, I.. (2008). Magnetotransport properties of CaTixRu1-xO3 (x=0, 0.07). in Acta Physica Polonica A, 113(1), 351-354.
https://doi.org/10.12693/APhysPolA.113.351

Zorkovska A, Baran A, Feher A, Sebek J, Santava E, Bradarić I. Magnetotransport properties of CaTixRu1-xO3 (x=0, 0.07). in Acta Physica Polonica A. 2008;113(1):351-354.
doi:10.12693/APhysPolA.113.351 .

Zorkovska, A., Baran, A., Feher, A., Sebek, J., Santava, E., Bradarić, Ivica, "Magnetotransport properties of CaTixRu1-xO3 (x=0, 0.07)" in Acta Physica Polonica A, 113, no. 1 (2008):351-354,
https://doi.org/10.12693/APhysPolA.113.351 . .

TY  - JOUR
AU  - Zorkovska, A.
AU  - Baran, A.
AU  - Kajnakova, M.
AU  - Feher, A.
AU  - Sebek, J.
AU  - Santava, E.
AU  - Bradarić, Ivica
PY  - 2008
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6716
AB  - The influence of Ti substitution on the specific heat of the CaTixRu1-xO3 system at low concentrations x = 0, 0.005, and 0.03 was studied in the temperature range of 2-300 K at magnetic fields tip to 9 T. Small peak was revealed in the C/T vs. T-2 dependence at around 3 K, which are field sensitive (the electronic specific heat coefficient gamma linearly decreases with the increase in magnetic field), and might be connected to some kind of magnetic ordering. The coefficient gamma is suppressed also by Ti substitution.
T2  - Acta Physica Polonica A
T1  - Ti-induced ferromagnetism and the specific heat of CaTixRu1-xO3 (x=0, 0.005, 0.03)
VL  - 113
IS  - 1
SP  - 355
EP  - 358
DO  - 10.12693/APhysPolA.113.355
ER  - 

@article{
author = "Zorkovska, A. and Baran, A. and Kajnakova, M. and Feher, A. and Sebek, J. and Santava, E. and Bradarić, Ivica",
year = "2008",
abstract = "The influence of Ti substitution on the specific heat of the CaTixRu1-xO3 system at low concentrations x = 0, 0.005, and 0.03 was studied in the temperature range of 2-300 K at magnetic fields tip to 9 T. Small peak was revealed in the C/T vs. T-2 dependence at around 3 K, which are field sensitive (the electronic specific heat coefficient gamma linearly decreases with the increase in magnetic field), and might be connected to some kind of magnetic ordering. The coefficient gamma is suppressed also by Ti substitution.",
journal = "Acta Physica Polonica A",
title = "Ti-induced ferromagnetism and the specific heat of CaTixRu1-xO3 (x=0, 0.005, 0.03)",
volume = "113",
number = "1",
pages = "355-358",
doi = "10.12693/APhysPolA.113.355"
}

Zorkovska, A., Baran, A., Kajnakova, M., Feher, A., Sebek, J., Santava, E.,& Bradarić, I.. (2008). Ti-induced ferromagnetism and the specific heat of CaTixRu1-xO3 (x=0, 0.005, 0.03). in Acta Physica Polonica A, 113(1), 355-358.
https://doi.org/10.12693/APhysPolA.113.355

Zorkovska A, Baran A, Kajnakova M, Feher A, Sebek J, Santava E, Bradarić I. Ti-induced ferromagnetism and the specific heat of CaTixRu1-xO3 (x=0, 0.005, 0.03). in Acta Physica Polonica A. 2008;113(1):355-358.
doi:10.12693/APhysPolA.113.355 .

Zorkovska, A., Baran, A., Kajnakova, M., Feher, A., Sebek, J., Santava, E., Bradarić, Ivica, "Ti-induced ferromagnetism and the specific heat of CaTixRu1-xO3 (x=0, 0.005, 0.03)" in Acta Physica Polonica A, 113, no. 1 (2008):355-358,
https://doi.org/10.12693/APhysPolA.113.355 . .

TY  - JOUR
AU  - Baran, A.
AU  - Zorkovska, A.
AU  - Feher, A.
AU  - Sebek, J.
AU  - Santava, E.
AU  - Hejtmanek, J.
AU  - Veverka, M.
AU  - Bradarić, Ivica
AU  - Ruzicka, M.
PY  - 2008
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6717
AB  - We present a comparative study of Na0.7CoO2 samples obtained from three different sources and prepared by different methods. The specific heat and magnetic susceptibility measurements in the temperature range 2-300 K show substantial influence on the observed anomalies, which underlines that the system is extremely sensitive to preparation protocols.
T2  - Acta Physica Polonica A
T1  - Low temperature anomalies in the specific heat and magnetic susceptibility of Na0.7CoO2 samples
VL  - 113
IS  - 1
SP  - 495
EP  - 498
DO  - 10.12693/APhysPolA.113.495
ER  - 

@article{
author = "Baran, A. and Zorkovska, A. and Feher, A. and Sebek, J. and Santava, E. and Hejtmanek, J. and Veverka, M. and Bradarić, Ivica and Ruzicka, M.",
year = "2008",
abstract = "We present a comparative study of Na0.7CoO2 samples obtained from three different sources and prepared by different methods. The specific heat and magnetic susceptibility measurements in the temperature range 2-300 K show substantial influence on the observed anomalies, which underlines that the system is extremely sensitive to preparation protocols.",
journal = "Acta Physica Polonica A",
title = "Low temperature anomalies in the specific heat and magnetic susceptibility of Na0.7CoO2 samples",
volume = "113",
number = "1",
pages = "495-498",
doi = "10.12693/APhysPolA.113.495"
}

Baran, A., Zorkovska, A., Feher, A., Sebek, J., Santava, E., Hejtmanek, J., Veverka, M., Bradarić, I.,& Ruzicka, M.. (2008). Low temperature anomalies in the specific heat and magnetic susceptibility of Na0.7CoO2 samples. in Acta Physica Polonica A, 113(1), 495-498.
https://doi.org/10.12693/APhysPolA.113.495

Baran A, Zorkovska A, Feher A, Sebek J, Santava E, Hejtmanek J, Veverka M, Bradarić I, Ruzicka M. Low temperature anomalies in the specific heat and magnetic susceptibility of Na0.7CoO2 samples. in Acta Physica Polonica A. 2008;113(1):495-498.
doi:10.12693/APhysPolA.113.495 .

Baran, A., Zorkovska, A., Feher, A., Sebek, J., Santava, E., Hejtmanek, J., Veverka, M., Bradarić, Ivica, Ruzicka, M., "Low temperature anomalies in the specific heat and magnetic susceptibility of Na0.7CoO2 samples" in Acta Physica Polonica A, 113, no. 1 (2008):495-498,
https://doi.org/10.12693/APhysPolA.113.495 . .

TY  - JOUR
AU  - Zorkovska, A.
AU  - Feher, A.
AU  - Sebek, J.
AU  - Santava, E.
AU  - Bradarić, Ivica
PY  - 2007
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3324
AB  - The specific heat in the temperature region from 100 mK to 360 K and in magnetic fields of 0 and 9 T and the susceptibility from 2 to 360 K and in a magnetic field of I T are measured in the layered NaxCoO2 (x=0.65, 0.70, and 0.75) oxides. Analysis of the data revealed non-Fermi-liquid behavior. The character of the observed anomalies seems to be connected to the mesoscopic phase separation, underlining the impact of disorder on the low-lying excitations in cobaltates. (c) 2007 American Institute of Physics.
T2  - Low Temperature Physics
T1  - Non-Fermi-liquid behavior in the layered NaxCoO2
VL  - 33
IS  - 11
SP  - 944
EP  - 947
DO  - 10.1063/1.2747070
ER  - 

@article{
author = "Zorkovska, A. and Feher, A. and Sebek, J. and Santava, E. and Bradarić, Ivica",
year = "2007",
abstract = "The specific heat in the temperature region from 100 mK to 360 K and in magnetic fields of 0 and 9 T and the susceptibility from 2 to 360 K and in a magnetic field of I T are measured in the layered NaxCoO2 (x=0.65, 0.70, and 0.75) oxides. Analysis of the data revealed non-Fermi-liquid behavior. The character of the observed anomalies seems to be connected to the mesoscopic phase separation, underlining the impact of disorder on the low-lying excitations in cobaltates. (c) 2007 American Institute of Physics.",
journal = "Low Temperature Physics",
title = "Non-Fermi-liquid behavior in the layered NaxCoO2",
volume = "33",
number = "11",
pages = "944-947",
doi = "10.1063/1.2747070"
}

Zorkovska, A., Feher, A., Sebek, J., Santava, E.,& Bradarić, I.. (2007). Non-Fermi-liquid behavior in the layered NaxCoO2. in Low Temperature Physics, 33(11), 944-947.
https://doi.org/10.1063/1.2747070

Zorkovska A, Feher A, Sebek J, Santava E, Bradarić I. Non-Fermi-liquid behavior in the layered NaxCoO2. in Low Temperature Physics. 2007;33(11):944-947.
doi:10.1063/1.2747070 .

Zorkovska, A., Feher, A., Sebek, J., Santava, E., Bradarić, Ivica, "Non-Fermi-liquid behavior in the layered NaxCoO2" in Low Temperature Physics, 33, no. 11 (2007):944-947,
https://doi.org/10.1063/1.2747070 . .

TY  - JOUR
AU  - Zorkovska, A.
AU  - Baran, A.
AU  - Bradarić, Ivica
AU  - Savić, Ilija
AU  - Sebek, J.
AU  - Santava, E.
AU  - Svoboda, Pavel
AU  - Marincev, D.
AU  - Kohout, S.
AU  - Keller, Hugo
AU  - Feher, A.
PY  - 2007
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6671
AB  - In order to shed more light on the character of magnetic correlations at low temperatures in CaRuO3, the delicate effect of substituting nonmagnetic Ti4+ for Ru4+ in low concentrations (0.5-15%) has been investigated by magnetization, AC-susceptibility and specific heat measurements. Despite the clear features in magnetic measurement data at 34K no specific heat anomaly has been observed, nevertheless, two temperature regions with different magnetic characters have been identified. . In pure CaRuO3 sisignificant low-temperature upturn of C/T is visible below 15 K. This feature is suppressed by Ti substitution. (c) 2007 Elsevier B.V. All rights reserved.
T2  - Journal of Magnetism and Magnetic Materials
T1  - Influence of Ti4+ on the magnetic state of CaRu1-xTixO3
VL  - 316
IS  - 2
SP  - E699
EP  - E702
DO  - 10.1016/j.jmmm.2007.03.065
ER  - 

@article{
author = "Zorkovska, A. and Baran, A. and Bradarić, Ivica and Savić, Ilija and Sebek, J. and Santava, E. and Svoboda, Pavel and Marincev, D. and Kohout, S. and Keller, Hugo and Feher, A.",
year = "2007",
abstract = "In order to shed more light on the character of magnetic correlations at low temperatures in CaRuO3, the delicate effect of substituting nonmagnetic Ti4+ for Ru4+ in low concentrations (0.5-15%) has been investigated by magnetization, AC-susceptibility and specific heat measurements. Despite the clear features in magnetic measurement data at 34K no specific heat anomaly has been observed, nevertheless, two temperature regions with different magnetic characters have been identified. . In pure CaRuO3 sisignificant low-temperature upturn of C/T is visible below 15 K. This feature is suppressed by Ti substitution. (c) 2007 Elsevier B.V. All rights reserved.",
journal = "Journal of Magnetism and Magnetic Materials",
title = "Influence of Ti4+ on the magnetic state of CaRu1-xTixO3",
volume = "316",
number = "2",
pages = "E699-E702",
doi = "10.1016/j.jmmm.2007.03.065"
}

Zorkovska, A., Baran, A., Bradarić, I., Savić, I., Sebek, J., Santava, E., Svoboda, P., Marincev, D., Kohout, S., Keller, H.,& Feher, A.. (2007). Influence of Ti4+ on the magnetic state of CaRu1-xTixO3. in Journal of Magnetism and Magnetic Materials, 316(2), E699-E702.
https://doi.org/10.1016/j.jmmm.2007.03.065

Zorkovska A, Baran A, Bradarić I, Savić I, Sebek J, Santava E, Svoboda P, Marincev D, Kohout S, Keller H, Feher A. Influence of Ti4+ on the magnetic state of CaRu1-xTixO3. in Journal of Magnetism and Magnetic Materials. 2007;316(2):E699-E702.
doi:10.1016/j.jmmm.2007.03.065 .

Zorkovska, A., Baran, A., Bradarić, Ivica, Savić, Ilija, Sebek, J., Santava, E., Svoboda, Pavel, Marincev, D., Kohout, S., Keller, Hugo, Feher, A., "Influence of Ti4+ on the magnetic state of CaRu1-xTixO3" in Journal of Magnetism and Magnetic Materials, 316, no. 2 (2007):E699-E702,
https://doi.org/10.1016/j.jmmm.2007.03.065 . .

TY  - JOUR
AU  - Zorkovska, A
AU  - Orendac, M
AU  - Sebek, J
AU  - Santava, E
AU  - Svoboda, Pavel
AU  - Bradarić, Ivica
AU  - Savić, Ilija
AU  - Feher, A
PY  - 2005
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/2942
AB  - Specific heat of layered NaxCoO2 (x=0.65, 0.70, and 0.75) oxides has been measured in the temperature range of 3-360 K and magnetic fields of 0 and 9 T. The analysis of data, assuming the combined effect of interlayer superexchange and the phase separation into mesoscopic magnetic domains with localized spins embedded in a matrix with an itinerant electronic character, suggests that the dominant contribution to the specific heat in the region of short-range ordering is mediated by quasi-two-dimensional antiferromagnetic clusters, perpendicular to the CoO2 layers.
T2  - Physical Review B: Condensed Matter and Materials Physics
T1  - Interplay between mesoscopic phase separation and bulk magnetism in the layered NaxCoO2
VL  - 72
IS  - 13
DO  - 10.1103/PhysRevB.72.132412
ER  - 

@article{
author = "Zorkovska, A and Orendac, M and Sebek, J and Santava, E and Svoboda, Pavel and Bradarić, Ivica and Savić, Ilija and Feher, A",
year = "2005",
abstract = "Specific heat of layered NaxCoO2 (x=0.65, 0.70, and 0.75) oxides has been measured in the temperature range of 3-360 K and magnetic fields of 0 and 9 T. The analysis of data, assuming the combined effect of interlayer superexchange and the phase separation into mesoscopic magnetic domains with localized spins embedded in a matrix with an itinerant electronic character, suggests that the dominant contribution to the specific heat in the region of short-range ordering is mediated by quasi-two-dimensional antiferromagnetic clusters, perpendicular to the CoO2 layers.",
journal = "Physical Review B: Condensed Matter and Materials Physics",
title = "Interplay between mesoscopic phase separation and bulk magnetism in the layered NaxCoO2",
volume = "72",
number = "13",
doi = "10.1103/PhysRevB.72.132412"
}

Zorkovska, A., Orendac, M., Sebek, J., Santava, E., Svoboda, P., Bradarić, I., Savić, I.,& Feher, A.. (2005). Interplay between mesoscopic phase separation and bulk magnetism in the layered NaxCoO2. in Physical Review B: Condensed Matter and Materials Physics, 72(13).
https://doi.org/10.1103/PhysRevB.72.132412

Zorkovska A, Orendac M, Sebek J, Santava E, Svoboda P, Bradarić I, Savić I, Feher A. Interplay between mesoscopic phase separation and bulk magnetism in the layered NaxCoO2. in Physical Review B: Condensed Matter and Materials Physics. 2005;72(13).
doi:10.1103/PhysRevB.72.132412 .

Zorkovska, A, Orendac, M, Sebek, J, Santava, E, Svoboda, Pavel, Bradarić, Ivica, Savić, Ilija, Feher, A, "Interplay between mesoscopic phase separation and bulk magnetism in the layered NaxCoO2" in Physical Review B: Condensed Matter and Materials Physics, 72, no. 13 (2005),
https://doi.org/10.1103/PhysRevB.72.132412 . .

TY  - CONF
AU  - Bradarić, Ivica
AU  - Savić, I.
AU  - Kohut, S.
AU  - Keller, H.
AU  - Yoshii, K.
AU  - Okayasu, S.
AU  - Carretta, P.
AU  - Prester, M.
PY  - 2004
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12900
AB  - Physics of ruthenates presents very attractive research field, recently. However, the nature of the ground state of CaRuO3 is not fully explored. Motivation for this study was to explore the influence of small concentrations of nonmagnetic substitutions for Ru4+ (Ti4+, Zr4+, Hf4+) on magnetic properties of material. Magnetic measurements (DC and AC method) show spin glass like magnetic ordering at T < 35 K for Ti4+ doped material, independently of concentration. On the other hand Zr4+ and Hf4+ doped materials show enhanced paramagnetism below 100 K. These results are completely unexpected, since Zr and Hf ions have larger ionic radii than Ti, and consequently produce larger frustration of the crystal lattice. Possible scenario of magnetic ordering of Ti4+ doped material is discussed.
C3  - SFKM 2004 : XVI National Symposium on Condensed Matter Physics : Program and Contributed Papers
T1  - The influence of nonmagnetic substitutions on magnetic properties of CaRuO3
SP  - 43
EP  - 43
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12900
ER  - 

@conference{
author = "Bradarić, Ivica and Savić, I. and Kohut, S. and Keller, H. and Yoshii, K. and Okayasu, S. and Carretta, P. and Prester, M.",
year = "2004",
abstract = "Physics of ruthenates presents very attractive research field, recently. However, the nature of the ground state of CaRuO3 is not fully explored. Motivation for this study was to explore the influence of small concentrations of nonmagnetic substitutions for Ru4+ (Ti4+, Zr4+, Hf4+) on magnetic properties of material. Magnetic measurements (DC and AC method) show spin glass like magnetic ordering at T < 35 K for Ti4+ doped material, independently of concentration. On the other hand Zr4+ and Hf4+ doped materials show enhanced paramagnetism below 100 K. These results are completely unexpected, since Zr and Hf ions have larger ionic radii than Ti, and consequently produce larger frustration of the crystal lattice. Possible scenario of magnetic ordering of Ti4+ doped material is discussed.",
journal = "SFKM 2004 : XVI National Symposium on Condensed Matter Physics : Program and Contributed Papers",
title = "The influence of nonmagnetic substitutions on magnetic properties of CaRuO3",
pages = "43-43",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12900"
}

Bradarić, I., Savić, I., Kohut, S., Keller, H., Yoshii, K., Okayasu, S., Carretta, P.,& Prester, M.. (2004). The influence of nonmagnetic substitutions on magnetic properties of CaRuO3. in SFKM 2004 : XVI National Symposium on Condensed Matter Physics : Program and Contributed Papers, 43-43.
https://hdl.handle.net/21.15107/rcub_vinar_12900

Bradarić I, Savić I, Kohut S, Keller H, Yoshii K, Okayasu S, Carretta P, Prester M. The influence of nonmagnetic substitutions on magnetic properties of CaRuO3. in SFKM 2004 : XVI National Symposium on Condensed Matter Physics : Program and Contributed Papers. 2004;:43-43.
https://hdl.handle.net/21.15107/rcub_vinar_12900 .

Bradarić, Ivica, Savić, I., Kohut, S., Keller, H., Yoshii, K., Okayasu, S., Carretta, P., Prester, M., "The influence of nonmagnetic substitutions on magnetic properties of CaRuO3" in SFKM 2004 : XVI National Symposium on Condensed Matter Physics : Program and Contributed Papers (2004):43-43,
https://hdl.handle.net/21.15107/rcub_vinar_12900 .

TY  - JOUR
AU  - Carretta, P
AU  - Mariani, M
AU  - Azzoni, CB
AU  - Mozzati, MC
AU  - Bradarić, Ivica
AU  - Savić, Ilija
AU  - Feher, A
AU  - Sebek, J
PY  - 2004
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/2793
AB  - Nuclear magnetic resonace (NMR), EPR and magnetization measurements in NaxCoO2 for 0.65less than or equal toxless than or equal to0.75 are presented. While the EPR signal arises from Co4+ magnetic moments ordering at T(c)similar or equal to26 K, Co-59 NMR signal originates from cobalt nuclei in metallic regions with no long range magnetic order and characterized by a generalized susceptibility typical of strongly correlated metallic systems. This phase separation in metallic and magnetic insulating regions is argued to occur below T-*(x) (220-270 K). Above T-* an anomalous decrease in the intensity of the EPR signal is observed and associated with the delocalization of the electrons which for T LT T-* were localized on Co4+ d(z)(2) orbitals. It is pointed out that the in-plane antiferromagnetic coupling JT(*) cannot be the driving force for the phase separation.
T2  - Physical Review B: Condensed Matter and Materials Physics
T1  - Mesoscopic phase separation in NaxCoO2 (0.65 LT = x LT = 0.75)
VL  - 70
IS  - 2
DO  - 10.1103/PhysRevB.70.024409
ER  - 

@article{
author = "Carretta, P and Mariani, M and Azzoni, CB and Mozzati, MC and Bradarić, Ivica and Savić, Ilija and Feher, A and Sebek, J",
year = "2004",
abstract = "Nuclear magnetic resonace (NMR), EPR and magnetization measurements in NaxCoO2 for 0.65less than or equal toxless than or equal to0.75 are presented. While the EPR signal arises from Co4+ magnetic moments ordering at T(c)similar or equal to26 K, Co-59 NMR signal originates from cobalt nuclei in metallic regions with no long range magnetic order and characterized by a generalized susceptibility typical of strongly correlated metallic systems. This phase separation in metallic and magnetic insulating regions is argued to occur below T-*(x) (220-270 K). Above T-* an anomalous decrease in the intensity of the EPR signal is observed and associated with the delocalization of the electrons which for T LT T-* were localized on Co4+ d(z)(2) orbitals. It is pointed out that the in-plane antiferromagnetic coupling JT(*) cannot be the driving force for the phase separation.",
journal = "Physical Review B: Condensed Matter and Materials Physics",
title = "Mesoscopic phase separation in NaxCoO2 (0.65 LT = x LT = 0.75)",
volume = "70",
number = "2",
doi = "10.1103/PhysRevB.70.024409"
}

Carretta, P., Mariani, M., Azzoni, C., Mozzati, M., Bradarić, I., Savić, I., Feher, A.,& Sebek, J.. (2004). Mesoscopic phase separation in NaxCoO2 (0.65 LT = x LT = 0.75). in Physical Review B: Condensed Matter and Materials Physics, 70(2).
https://doi.org/10.1103/PhysRevB.70.024409

Carretta P, Mariani M, Azzoni C, Mozzati M, Bradarić I, Savić I, Feher A, Sebek J. Mesoscopic phase separation in NaxCoO2 (0.65 LT = x LT = 0.75). in Physical Review B: Condensed Matter and Materials Physics. 2004;70(2).
doi:10.1103/PhysRevB.70.024409 .

Carretta, P, Mariani, M, Azzoni, CB, Mozzati, MC, Bradarić, Ivica, Savić, Ilija, Feher, A, Sebek, J, "Mesoscopic phase separation in NaxCoO2 (0.65 LT = x LT = 0.75)" in Physical Review B: Condensed Matter and Materials Physics, 70, no. 2 (2004),
https://doi.org/10.1103/PhysRevB.70.024409 . .

TY  - JOUR
AU  - Zorkovska, A
AU  - Vlcek, A
AU  - Orendac, M
AU  - Feher, A
AU  - Sebek, J
AU  - Santava, E
AU  - Svoboda, Pavel
AU  - Bradarić, Ivica
AU  - Savić, Ilija
PY  - 2004
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6495
AB  - Specific heat of the layered Na0.65CoO2 powder sample over the temperature region of 3-360 K has been studied. Features hinting at charge ordering below room-temperature were observed. Magnetic phase transition at 28 K as well as signs of short-range ordering confirm the 2D character of magnetism with weak inter-planar coupling in the system. Comparison to different 2D antiferromagnetic models suggests that the magnetic lattice is more square- than triangular-like, what could be favoured by the charge ordering.
T2  - Czechoslovak Journal of Physics
T1  - Thermodynamic properties of Na0.65CoO2
VL  - 54
SP  - D539
EP  - D542
DO  - 10.1007/s10582-004-0138-8
ER  - 

@article{
author = "Zorkovska, A and Vlcek, A and Orendac, M and Feher, A and Sebek, J and Santava, E and Svoboda, Pavel and Bradarić, Ivica and Savić, Ilija",
year = "2004",
abstract = "Specific heat of the layered Na0.65CoO2 powder sample over the temperature region of 3-360 K has been studied. Features hinting at charge ordering below room-temperature were observed. Magnetic phase transition at 28 K as well as signs of short-range ordering confirm the 2D character of magnetism with weak inter-planar coupling in the system. Comparison to different 2D antiferromagnetic models suggests that the magnetic lattice is more square- than triangular-like, what could be favoured by the charge ordering.",
journal = "Czechoslovak Journal of Physics",
title = "Thermodynamic properties of Na0.65CoO2",
volume = "54",
pages = "D539-D542",
doi = "10.1007/s10582-004-0138-8"
}

Zorkovska, A., Vlcek, A., Orendac, M., Feher, A., Sebek, J., Santava, E., Svoboda, P., Bradarić, I.,& Savić, I.. (2004). Thermodynamic properties of Na0.65CoO2. in Czechoslovak Journal of Physics, 54, D539-D542.
https://doi.org/10.1007/s10582-004-0138-8

Zorkovska A, Vlcek A, Orendac M, Feher A, Sebek J, Santava E, Svoboda P, Bradarić I, Savić I. Thermodynamic properties of Na0.65CoO2. in Czechoslovak Journal of Physics. 2004;54:D539-D542.
doi:10.1007/s10582-004-0138-8 .

Zorkovska, A, Vlcek, A, Orendac, M, Feher, A, Sebek, J, Santava, E, Svoboda, Pavel, Bradarić, Ivica, Savić, Ilija, "Thermodynamic properties of Na0.65CoO2" in Czechoslovak Journal of Physics, 54 (2004):D539-D542,
https://doi.org/10.1007/s10582-004-0138-8 . .

TY  - JOUR
AU  - Blanuša, Jovan
AU  - Mitrić, Miodrag
AU  - Felner, I
AU  - Jović, Nataša G.
AU  - Bradarić, Ivica
PY  - 2003
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/2648
AB  - The X-ray powder diffraction patterns of La2-xEr2O3 (X = 0,2, 0.3, 1, 1.8, 2) samples were refined by the Rietveld full profile method. The magnetic susceptibility was measured in the temperature range 4-300 K, and the magnetic behavior of trivalent erbium ion is discussed in connection with the different local symmetry sites. (C) 2003 Elsevier Science B.V. All rights reserved.
T2  - Journal of Magnetism and Magnetic Materials
T1  - The crystal structure refinement and magnetic susceptibility study of La2-xErxO3
VL  - 263
IS  - 3
SP  - 295
EP  - 300
DO  - 10.1016/S0304-8853(03)00065-9
ER  - 

@article{
author = "Blanuša, Jovan and Mitrić, Miodrag and Felner, I and Jović, Nataša G. and Bradarić, Ivica",
year = "2003",
abstract = "The X-ray powder diffraction patterns of La2-xEr2O3 (X = 0,2, 0.3, 1, 1.8, 2) samples were refined by the Rietveld full profile method. The magnetic susceptibility was measured in the temperature range 4-300 K, and the magnetic behavior of trivalent erbium ion is discussed in connection with the different local symmetry sites. (C) 2003 Elsevier Science B.V. All rights reserved.",
journal = "Journal of Magnetism and Magnetic Materials",
title = "The crystal structure refinement and magnetic susceptibility study of La2-xErxO3",
volume = "263",
number = "3",
pages = "295-300",
doi = "10.1016/S0304-8853(03)00065-9"
}

Blanuša, J., Mitrić, M., Felner, I., Jović, N. G.,& Bradarić, I.. (2003). The crystal structure refinement and magnetic susceptibility study of La2-xErxO3. in Journal of Magnetism and Magnetic Materials, 263(3), 295-300.
https://doi.org/10.1016/S0304-8853(03)00065-9

Blanuša J, Mitrić M, Felner I, Jović NG, Bradarić I. The crystal structure refinement and magnetic susceptibility study of La2-xErxO3. in Journal of Magnetism and Magnetic Materials. 2003;263(3):295-300.
doi:10.1016/S0304-8853(03)00065-9 .

Blanuša, Jovan, Mitrić, Miodrag, Felner, I, Jović, Nataša G., Bradarić, Ivica, "The crystal structure refinement and magnetic susceptibility study of La2-xErxO3" in Journal of Magnetism and Magnetic Materials, 263, no. 3 (2003):295-300,
https://doi.org/10.1016/S0304-8853(03)00065-9 . .

TY  - JOUR
AU  - Bradarić, Ivica
AU  - Felner, I
AU  - Gospodinov, M
PY  - 2002
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/2493
AB  - CaRuO3 is a perovskite with an orthorhombic distortion, and is believed to be close to magnetic ordering. Magnetic studies of single-crystal and polycrystalline CaRu1-xCuxO3 (0less than or equal toxless than or equal to15 at. %Cu) reveal that a spin-glass-like transition develops for xless than or equal to7 at. % Cu. The obtained value for the effective magnetic moment p(eff) =3.55 mu(B) for an x=5 at. % Cu single crystal, indicates the presence of Ru5+. At higher Cu concentrations more complex magnetic behaviors are observed. Electrical resistivity measured on polycrystalline samples shows a metal-to-insulator transition at 51 K for only 2-at. % Cu. Charge compensation, which is assumed to be present upon Cu2+/3+ substitution, induces the appearance of Ru5+ and/or the creation of oxygen vacancies in a crystal structure. Since the observed changes in physical properties are completely attributable to the charge compensation, they cannot be related to behaviors of a pure compound where no such mechanism is present. This study provides the criterion for good chemical probes for studying Ru-based perovskites.
T2  - Physical Review B: Condensed Matter and Materials Physics
T1  - Metal-to-insulator transition and magnetic ordering in CaRu1-xCuxO3
VL  - 65
IS  - 2
DO  - 10.1103/PhysRevB.65.024421
ER  - 

@article{
author = "Bradarić, Ivica and Felner, I and Gospodinov, M",
year = "2002",
abstract = "CaRuO3 is a perovskite with an orthorhombic distortion, and is believed to be close to magnetic ordering. Magnetic studies of single-crystal and polycrystalline CaRu1-xCuxO3 (0less than or equal toxless than or equal to15 at. %Cu) reveal that a spin-glass-like transition develops for xless than or equal to7 at. % Cu. The obtained value for the effective magnetic moment p(eff) =3.55 mu(B) for an x=5 at. % Cu single crystal, indicates the presence of Ru5+. At higher Cu concentrations more complex magnetic behaviors are observed. Electrical resistivity measured on polycrystalline samples shows a metal-to-insulator transition at 51 K for only 2-at. % Cu. Charge compensation, which is assumed to be present upon Cu2+/3+ substitution, induces the appearance of Ru5+ and/or the creation of oxygen vacancies in a crystal structure. Since the observed changes in physical properties are completely attributable to the charge compensation, they cannot be related to behaviors of a pure compound where no such mechanism is present. This study provides the criterion for good chemical probes for studying Ru-based perovskites.",
journal = "Physical Review B: Condensed Matter and Materials Physics",
title = "Metal-to-insulator transition and magnetic ordering in CaRu1-xCuxO3",
volume = "65",
number = "2",
doi = "10.1103/PhysRevB.65.024421"
}

Bradarić, I., Felner, I.,& Gospodinov, M.. (2002). Metal-to-insulator transition and magnetic ordering in CaRu1-xCuxO3. in Physical Review B: Condensed Matter and Materials Physics, 65(2).
https://doi.org/10.1103/PhysRevB.65.024421

Bradarić I, Felner I, Gospodinov M. Metal-to-insulator transition and magnetic ordering in CaRu1-xCuxO3. in Physical Review B: Condensed Matter and Materials Physics. 2002;65(2).
doi:10.1103/PhysRevB.65.024421 .

Bradarić, Ivica, Felner, I, Gospodinov, M, "Metal-to-insulator transition and magnetic ordering in CaRu1-xCuxO3" in Physical Review B: Condensed Matter and Materials Physics, 65, no. 2 (2002),
https://doi.org/10.1103/PhysRevB.65.024421 . .

TY  - JOUR
AU  - Felner, I
AU  - Bradarić, Ivica
PY  - 2002
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/2510
AB  - The present study summarizes magnetic and Mossbauer measurements on ceramic Li2MO3 M = Mn. Ru and Ir and the mixed Li-2(Mn1-xRux)O-3 materials which show many of the features reflecting to antiferromagnetic ordering or to the existence of paramagnetic states. Li2ArO3 and Li2RuO3 are paramagnetic down to 5K. Li-2(Mn1-xRux)O-3 compounds are antiferromagnetically ordered at T-N = 48 K for x = 0. T-N decreases as the Ru content increases and, for x = 0.8, T-N = 34 K. (C) 2002 Elsevier Science B.V. All rights reserved.
T2  - Physica B: Condensed Matter
T1  - The magnetic behavior of Li2MO3 (M = Mn, Ru and Ir) and Li-2(Mn1-xRux)O-3
VL  - 311
IS  - 3-4
SP  - 195
EP  - 199
DO  - 10.1016/S0921-4526(01)01038-9
ER  - 

@article{
author = "Felner, I and Bradarić, Ivica",
year = "2002",
abstract = "The present study summarizes magnetic and Mossbauer measurements on ceramic Li2MO3 M = Mn. Ru and Ir and the mixed Li-2(Mn1-xRux)O-3 materials which show many of the features reflecting to antiferromagnetic ordering or to the existence of paramagnetic states. Li2ArO3 and Li2RuO3 are paramagnetic down to 5K. Li-2(Mn1-xRux)O-3 compounds are antiferromagnetically ordered at T-N = 48 K for x = 0. T-N decreases as the Ru content increases and, for x = 0.8, T-N = 34 K. (C) 2002 Elsevier Science B.V. All rights reserved.",
journal = "Physica B: Condensed Matter",
title = "The magnetic behavior of Li2MO3 (M = Mn, Ru and Ir) and Li-2(Mn1-xRux)O-3",
volume = "311",
number = "3-4",
pages = "195-199",
doi = "10.1016/S0921-4526(01)01038-9"
}

Felner, I.,& Bradarić, I.. (2002). The magnetic behavior of Li2MO3 (M = Mn, Ru and Ir) and Li-2(Mn1-xRux)O-3. in Physica B: Condensed Matter, 311(3-4), 195-199.
https://doi.org/10.1016/S0921-4526(01)01038-9

Felner I, Bradarić I. The magnetic behavior of Li2MO3 (M = Mn, Ru and Ir) and Li-2(Mn1-xRux)O-3. in Physica B: Condensed Matter. 2002;311(3-4):195-199.
doi:10.1016/S0921-4526(01)01038-9 .

Felner, I, Bradarić, Ivica, "The magnetic behavior of Li2MO3 (M = Mn, Ru and Ir) and Li-2(Mn1-xRux)O-3" in Physica B: Condensed Matter, 311, no. 3-4 (2002):195-199,
https://doi.org/10.1016/S0921-4526(01)01038-9 . .

TY  - JOUR
AU  - Felner, I
AU  - Asaf, U
AU  - Nowik, I
AU  - Bradarić, Ivica
PY  - 2002
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/2545
AB  - CaRuO3 is a perovskite with an orthorhombic distortion and shows the characteristics of spin-glass behavior below T-C=87 K. Magnetic studies of polycrystalline CaRu1-xTixO3 (0 LT x LT 0.1) reveal that a ferromagnetic transition at T-C=34 K appears regardless of the nonmagnetic Ti concentration. On the other hand, magnetic and Mossbauer effect studies show that T-C of CaRu1-xFexO3 (up to x=0.15) is similar to that of pure CaRuO3: however, the Fe induces a ferromagnetic structure. Charge compensation, which is assumed to be present upon Fe3+ substitution, induces the appearance of low-spin Ru5+ ions, which reduce the paramagnetic moment. Huge magnetic hysteresis loops are observed at 5 K, with coercive fields up to 30 kOe. A second magnetic transition around 250 K is observed for Fe concentrations of x=0.25 and 0.35, which is probably caused by Fe-rich clusters. This behavior is consistent with inhomogeneous ferromagnetism found in other perovskite systems.
T2  - Physical Review B: Condensed Matter and Materials Physics
T1  - Magnetic and Mossbauer studies of CaRu(1-)xM(x)O(3) (M = Ti and Fe)
VL  - 66
IS  - 5
DO  - 10.1103/PhysRevB.66.054418
ER  - 

@article{
author = "Felner, I and Asaf, U and Nowik, I and Bradarić, Ivica",
year = "2002",
abstract = "CaRuO3 is a perovskite with an orthorhombic distortion and shows the characteristics of spin-glass behavior below T-C=87 K. Magnetic studies of polycrystalline CaRu1-xTixO3 (0 LT x LT 0.1) reveal that a ferromagnetic transition at T-C=34 K appears regardless of the nonmagnetic Ti concentration. On the other hand, magnetic and Mossbauer effect studies show that T-C of CaRu1-xFexO3 (up to x=0.15) is similar to that of pure CaRuO3: however, the Fe induces a ferromagnetic structure. Charge compensation, which is assumed to be present upon Fe3+ substitution, induces the appearance of low-spin Ru5+ ions, which reduce the paramagnetic moment. Huge magnetic hysteresis loops are observed at 5 K, with coercive fields up to 30 kOe. A second magnetic transition around 250 K is observed for Fe concentrations of x=0.25 and 0.35, which is probably caused by Fe-rich clusters. This behavior is consistent with inhomogeneous ferromagnetism found in other perovskite systems.",
journal = "Physical Review B: Condensed Matter and Materials Physics",
title = "Magnetic and Mossbauer studies of CaRu(1-)xM(x)O(3) (M = Ti and Fe)",
volume = "66",
number = "5",
doi = "10.1103/PhysRevB.66.054418"
}

Felner, I., Asaf, U., Nowik, I.,& Bradarić, I.. (2002). Magnetic and Mossbauer studies of CaRu(1-)xM(x)O(3) (M = Ti and Fe). in Physical Review B: Condensed Matter and Materials Physics, 66(5).
https://doi.org/10.1103/PhysRevB.66.054418

Felner I, Asaf U, Nowik I, Bradarić I. Magnetic and Mossbauer studies of CaRu(1-)xM(x)O(3) (M = Ti and Fe). in Physical Review B: Condensed Matter and Materials Physics. 2002;66(5).
doi:10.1103/PhysRevB.66.054418 .

Felner, I, Asaf, U, Nowik, I, Bradarić, Ivica, "Magnetic and Mossbauer studies of CaRu(1-)xM(x)O(3) (M = Ti and Fe)" in Physical Review B: Condensed Matter and Materials Physics, 66, no. 5 (2002),
https://doi.org/10.1103/PhysRevB.66.054418 . .

TY  - JOUR
AU  - Felner, I
AU  - Nowik, I
AU  - Bradarić, Ivica
AU  - Gospodinov, M
PY  - 2000
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/2389
AB  - Magnetic studies of ceramic and single crystal CaRuO3 samples demonstrate that irreversibility appears in the zero-field-cooled field-cooled curves only when measured at low applied magnetic fields. A small hysteresis loop opens at low temperatures, and the remanent magnetization decreases with temperature and disappears at similar to 90 and 71 K for the ceramic and crystal samples, respectively. The easy axis for the magnetization is in the [001]. Mossbauer studies of 1% Fe-57 doped in CaRuO3 show a magnetic sextet at 4.1 K which disappears at 90 K. It is proposed that CaRuO3 is not paramagnetic, but rather shows the characteristics of short range magnetic interactions, possibly as spin-glass-like behavior. Fe-57 ions experience an exchange field from their magnetic Ru neighbors and also become magnetically ordered.
T2  - Physical Review B: Condensed Matter and Materials Physics
T1  - CaRuO3 is not a paramagnetic material
VL  - 62
IS  - 17
SP  - 11332
EP  - 11335
DO  - 10.1103/PhysRevB.62.11332
ER  - 

@article{
author = "Felner, I and Nowik, I and Bradarić, Ivica and Gospodinov, M",
year = "2000",
abstract = "Magnetic studies of ceramic and single crystal CaRuO3 samples demonstrate that irreversibility appears in the zero-field-cooled field-cooled curves only when measured at low applied magnetic fields. A small hysteresis loop opens at low temperatures, and the remanent magnetization decreases with temperature and disappears at similar to 90 and 71 K for the ceramic and crystal samples, respectively. The easy axis for the magnetization is in the [001]. Mossbauer studies of 1% Fe-57 doped in CaRuO3 show a magnetic sextet at 4.1 K which disappears at 90 K. It is proposed that CaRuO3 is not paramagnetic, but rather shows the characteristics of short range magnetic interactions, possibly as spin-glass-like behavior. Fe-57 ions experience an exchange field from their magnetic Ru neighbors and also become magnetically ordered.",
journal = "Physical Review B: Condensed Matter and Materials Physics",
title = "CaRuO3 is not a paramagnetic material",
volume = "62",
number = "17",
pages = "11332-11335",
doi = "10.1103/PhysRevB.62.11332"
}

Felner, I., Nowik, I., Bradarić, I.,& Gospodinov, M.. (2000). CaRuO3 is not a paramagnetic material. in Physical Review B: Condensed Matter and Materials Physics, 62(17), 11332-11335.
https://doi.org/10.1103/PhysRevB.62.11332

Felner I, Nowik I, Bradarić I, Gospodinov M. CaRuO3 is not a paramagnetic material. in Physical Review B: Condensed Matter and Materials Physics. 2000;62(17):11332-11335.
doi:10.1103/PhysRevB.62.11332 .

Felner, I, Nowik, I, Bradarić, Ivica, Gospodinov, M, "CaRuO3 is not a paramagnetic material" in Physical Review B: Condensed Matter and Materials Physics, 62, no. 17 (2000):11332-11335,
https://doi.org/10.1103/PhysRevB.62.11332 . .