Anomalous ESR behavior in charge-ordered insulator <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:msub><mml:mrow><mml:mi>Na</mml:mi></mml:mrow><mml:mrow><mml:mn>0.5</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi>CoO</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:math>
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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.
収録刊行物
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- Journal of Magnetism and Magnetic Materials
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Journal of Magnetism and Magnetic Materials 310 e275-e277, 2007-03-01
Elsevier BV
