Low Temperature Anomalies in the Specific Heat and Magnetic Susceptibility of Na0.7CoO2 Samples |
| A. Baran, A. Zorkovská, A. Feher
Centre of Low Temperature Physics of the Faculty of Science UPJŠ, and Institute of Experimental Physics, SAS, 041 54 Košice, Slovakia J. Šebek, E. Šantavá, J. Hejtmánek, M. Veverkai Institute of Physics AS CR, 18221 Prague, Czech Republic I. Bradarić The "Vinča" Institute of Nuclear Sciences, 11001 Belgrade, Serbia and M. Ružička Faculty of Chemical and Food Technology, STU, 812 43, Bratislava, Slovakia |
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| Received: 9 07 2007; |
| 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. |
| DOI: 10.12693/APhysPolA.113.495 PACS numbers: 75.40.Cx, 72.80.Ga |