Magnetic Fluctuations in the Metallic State of Na_<0.7>CoO_2 Revealed by ^<23>Na Nuclear Magnetic Resonance(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
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概要
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Nuclear magnetic resonance (NMR) studies were performed on Na_<0.7>CoO_2 to investigate its magnetic properties from the microscopic viewpoint. Na_<0.7>CoO_2 is a starting compound of the recently discovered superconductor Na_<0.35>CoO_2・1.3H_2O, in which Co atoms form a triangular structure. Although ^<23>Na NMR results show no magnetic anomaly down to 1.5 K, Knight shift (^<23>K) and ^<23>(1/T_1T) of ^<23>Na continue to increase, suggestive of the vicinity of the magnetic phase. From the relation between ^<23>K and ^<23>(1/T_1T), it is shown that ferromagnetic fluctuations are dominant below 100K. In addition to ferromagnetic correlations, antiferromagnetic fluctuations are found develop to in a low-temperature region below 4K. Magnetic fluctuations considered from our experiment are discussed.
- 2004-11-15
著者
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Ihara Yoshihiko
Department Of Physics Graduate School Of Science Kyoto University
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Yoshimura Kazuyoshi
Department Of Applied Science Tokyo Electrical Engineering College
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Sakurai Hiroya
Superconducting Materials Center National Institute For Materials Science (smc
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Michioka Chishiro
Department Of Chemistry Graduate School Of Science Kyoto University
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Takayama-muromachi Eiji
Superconducting Materials Center National Institute For Materials Science
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Kato Masaki
Department Of Chemical Science And Engineering Graduate School Of Engineering Science Osaka Universi
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Ishida Kenji
Department of Applied Chemistry, Ibaraki University
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