Abstract
X-band ESR measurements have been performed on Na 0.5 CoO 2 in the temperature region between 4.5 K and room temperature. The anisotropic g values were observed at room temperature. A large g shift and an increase of the linewidth were also observed as temperature was decreased above T c 1 = 87 K . In addition, no clear signal was observed below T c 1 in a range of the measured magnetic field and this behavior supports the long range antiferromagnetic order at T c 1 . The origin of the large g shift with decreasing temperature will be discussed.
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