Multigap Superconductivity in Y_2C_3 : A ^<13>C-NMR Study(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
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概要
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We report on the superconducting properties of Y_2C_3 with a relatively high transition temperature T_c=15.7K investigated by ^<13>C nuclear-magnetic-resonance (NMR) measurements under a magnetic field. The ^<13>C Knight shift has revealed a significant decrease below T_c, suggesting a spin-singlet superconductivity. From an analysis of the temperature dependence of the nuclear spin-lattice relaxation rate 1/T_1 in the superconducting state, Y_2C_3 is demonstrated to be a multigap superconductor that exhibits a large gap 2Δ/k_BT_c=5 at the main band and a small gap 2Δ/k_BT_c=2 at other bands. These results have revealed that Y_2C_3 is a unique multigap s-wave superconductor similar to MgB_2.
- 社団法人日本物理学会の論文
- 2007-02-15
著者
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Kitaoka Y.
Department Of Materials Engineering Science Graduate School Of Engineering Science Osaka University
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HARADA A.
Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka Universit
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Akimitsu J.
Depart, of Physics Aoyma Gakuin Univ.
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Mukuda H.
Department Of Materials Engineering Science Graduate School Of Engineering Science Osaka University
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AKUTAGAWA S.
Department of Physics and Mathematics, Aoyama Gakuin University
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MIYAMICHI Y.
Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka Universit
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Miyamichi Y.
Department Of Materials Engineering Science Graduate School Of Engineering Science Osaka University
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Akutagawa S.
Department Of Physics And Mathematics Aoyama Gakuin University
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Kitaoka Y.
Department Of Material Physics Osaka University Toyonaka-shi Osaka 560 Japan
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