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  - 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  - 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 . .