Heat capacity studies of magnetic phase transition in sodium-rich NaxCoO2 (0.73 ≤ x ≤ 0.87)

Автор(и)

  • A. Baran Centre of Low Temperature Physics of the Faculty of Science UPJŠ & Institute of Experimental Physics SAS 9 Park Angelinum, Košice 04154, Slovakia
  • M. Botko Centre of Low Temperature Physics of the Faculty of Science UPJŠ & Institute of Experimental Physics SAS 9 Park Angelinum, Košice 04154, Slovakia
  • A. Zorkovská Centre of Low Temperature Physics of the Faculty of Science UPJŠ & Institute of Experimental Physics SAS 9 Park Angelinum, Košice 04154, Slovakia
  • M. Kajňaková Centre of Low Temperature Physics of the Faculty of Science UPJŠ & Institute of Experimental Physics SAS 9 Park Angelinum, Košice 04154, Slovakia
  • J. Šebek Institute of Physics AS CR, Prague 18221, Czech Republic
  • E. Šantavá Institute of Physics AS CR, Prague 18221, Czech Republic
  • J.P. Peng Max-Planck-Institute for Solid State Research, 1 Heisenbergstr, Stuttgart D-70569, Germany
  • C.T. Lin Max-Planck-Institute for Solid State Research, 1 Heisenbergstr, Stuttgart D-70569, Germany
  • A. Feher Centre of Low Temperature Physics of the Faculty of Science UPJŠ & Institute of Experimental Physics SAS 9 Park Angelinum, Košice 04154, Slovakia

DOI:

https://doi.org/10.1063/1.3253404

Ключові слова:

cobaltates, specific heat, magnetic phase transition, A-type antiferromagnetism.

Анотація

Specific heat measurements in the temperature region from 2 to 50 K in magnetic field up to 10 T, oriented parallel and perpendicularly to the CoO2 layers were carried out on a series of high-quality single- crystals of NaxCoO2 (x = 0.73, 0.76, 0.77, 0.78 and 0.87). Surprisingly, sharp lambda type anomaly was observed only for the concentration x = 0.76 at temperature (21.80 ± 0.02) K, for all the remaining doping levels round anomaly in experimental data was visible at temperature ~ 20 K, indicating a smeared magnetic phase transition. While the magnetic field oriented perpendicularly to the CoO2 layers shifts the temperature of this anomaly to lower values, parallel magnetic field has no influence on it, what indirectly supports the idea of A-type antiferromagnetic ordering in studied systems.

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Опубліковано

2009-08-28

Як цитувати

(1)
Baran, A.; Botko, M.; Zorkovská, A.; Kajňaková, M.; Šebek, J.; Šantavá, E.; Peng, J.; Lin, C.; Feher, A. Heat Capacity Studies of Magnetic Phase Transition in Sodium-Rich NaxCoO2 (0.73 ≤ x ≤ 0.87). Fiz. Nizk. Temp. 2009, 35, 1030-1033.

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Розділ

Низькотемпературний магнетизм

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