Interplay between mesoscopic phase separation and bulk magnetism in the layered NaxCoO2
A. Zorkovska, M. Orendac, J. Sebek, E. Santava, P. Svoboda, I. Bradaric, I. Savic, A. Feher
Abstract
Specific heat of the layered NaxCoO2 (x=0.65, 0.70 and 0.75) oxides has been measured in the temperature range of 3-360 K and magnetic field of 0 and 9 T. The analysis of data, assuming the combined effect of inter-layer superexchange and the phase separation into mesoscopic magnetic domains with localized spins embedded in a matrix with itinerant electronic character, suggests that the dominant contribution to the specific heat in the region of short-range ordering is mediated by quasi-2D antiferromagnetic clusters, perpendicular to the CoO2 layers.
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