Non-Fermi-liquid behavior in the layered NaxCoO2
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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.