NMR Study of Chevrel Phase Superconductors
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概要
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Knight shift, K, nuclear spin-lattice relaxation time, T_1, and spin echo decay time, T_2, at various sites have been measured for SnMo_6Se_8, PbMo_6Se_8 and PbMo_6S_8. K shows little change in the superconducting state from the value of normal state, which implies the remaining of the spin susceptibility of conduction electrons in the superconducting state. The density of state at the Fermi level is evaluated from T_1 in the normal state. The agreement of the results with the recent band calculation is satisfactory except for Se site, where the experimental result suggests larger density of state. The superconducting energy gaps are about 3.5 k_BT_C(0) for all sites. Not only d-electrons of Mo but s- or p-electrons of Sn, Pb and Se atoms take part in the superconductivity. T_2 for all sites decreases with the onset of the superconductivity. This may be attributed to the conversion of the indirect coupling between like spins to the unlike ones effectively owing to the field inhomogeneity due to vortices.
- 社団法人日本物理学会の論文
- 1981-12-15
著者
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Asayama Kunisuke
Department of Material Physics, Faculty of Engineering Science, Osaka University
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Asayama Kunisuke
Department Of Material Physics Faculty Of Engineering Science Osaka University
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Sano Naokatsu
Department Of Physics School Of Science Kwansei Gakuin University
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Sano Naokatsu
Department Of Physics Faculty Of Science Kwansei Gakuin University
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MATSUMURA Masahiro
Department of Physics, Kobe University
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TANIGUCHI Tadashi
Faculty of Engineering Science, Osaka University
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Matsumura Masahiro
Department Of Material Science Faculty Of Science Kochi University
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Matsumura Masahiro
Department Of Physics Kobe University:(present Address)departmet Of Physics Faculty Of Science Kochi
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Asayama Kunisuke
Department Of Physics Kobe University
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Taniguchi Tadashi
Faculty Of Engineering Science Osaka University:(present Address)sony Corporation Research Center
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ASAYAMA Kunisuke
Department of Physics, Kobe University
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