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X-band ESR measurements have been performed on Na0.5CoO2 in the temperature region between 4.5K 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 Tc1=87K. In addition, no clear signal was observed below Tc1 in a range of the measured magnetic field and this behavior...
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