Anisotropic Behavior of Knight Shift in Superconducting State of Na_xCoO_2・yH_2O(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
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概要
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The Co Knight shift was measured in an aligned powder sample of Na_xCoO_2・yH_2O, which shows superconductivity at T_c〜4.6K. The Knight-shift components parallel (K_c) and perpendicular to the c-axis (along the ab plane K_<ab>) were measured in both the normal and superconducting (SC) states. The temperature dependences of K_<ab> and K_c are scaled with the bulk susceptibility, which shows that the microscopic susceptibility deduced from the Knight shift is related to Co-3d spins. In the SC state, the Knight shift shows an anisotropic temperature dependence : K_<ab> decreases below 5K, whereas K_c does not decrease within experimental accuracy. This result raises the possibility that spin-triplet superconductivity with the spin component of the pairs directed along the c-axis is realized in Na_xCoO_2・yH_2O.
- 2006-01-15
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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Itoh Yutaka
Department Of Chemistry Graduate School Of Science Kyoto University
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Sakurai Hiroya
Superconducting Materials Center National Institute For Materials Science (smc
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Takeya Hideo
Department Of Physics Graduate School Of Science Kyoto University
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Michioka Chishiro
Department Of Chemistry Graduate School Of Science Kyoto University
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Muromachi Eiji
Superconducting Materials Center National Institute For Materials Science
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Takada Kazunori
Advanced Materials Laboratory National Institute For Materials Science
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Sasaki Takayoshi
Advanced Materials Laboratory 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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