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  - 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 . .