Co-NMR Measurements on Crystalline Sample of the Bilayere Hydrate Na_x(H_3O)_zCoO_2・yH_2O(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
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概要
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Co-nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) measurements were performed on a c-axis-aligned crystalline sample of cobaltate superconductor Na_x(H_3O)_zCoO_2・yH_2O. The sample properties were characterized in detail by using the NMR and NQR measurements, and the sample was confirmed to exhibit a clear superconducting transition at T_c=4.56K. The external field direction was controlled by rotating the sample at low temperatures. The detailed analyses of the NMR spectra revealed that the c-axis direction of the crystalline sample was distributed within ±2.5°. The relaxation rate divided by temperature 1/T_1T and Knight shift were measured in the superconducting state. The Knight shift decreased by approximately 0.015% below T_c, which is almost one order smaller than those reported previously. The value of the decrease was the same order as the superconducting diamagnetic effect. The quantitative discussion is given to the Knight shift in the superconducting state.
- 社団法人日本物理学会の論文
- 2008-07-15
著者
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YOSHIMURA Kazuyoshi
Department of Chemistry, Graduate School of Science, Kyoto University
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Ihara Yoshihiko
Department Of Physics Graduate School Of Science Kyoto University
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ISHIDA Kenji
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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OHTA Hiroto
Department of Chemistry, Graduate School of Science, Kyoto University
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Ohta Hiroto
Department Of Chemistry Graduate School Of Science Kyoto University
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Ishida Kohtaro
Department Of Physics Faculty Of Science And Technology Science Uniersity Of Tokyo
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Ishida Kohtaro
Department Of Physics Faculty Of Sciense And Technology Science University Of Tokyo
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Ishida Kohtaro
Depatment Of Physics Faculty Of Science And Technology Science University Of Tokyo
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Ishida Kenji
Department Of Chemical Science And Engineering Graduate School Of Engineering Kobe University
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