Anisotropic Behavior of Knight Shift in Superconducting State of NaxCoO2・yH2O

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  • Ihara Yoshihiko
    Department of Physics, Graduate School of Science, Kyoto University
  • Ishida Kenji
    Department of Physics, Graduate School of Science, Kyoto University
  • Takeya Hideo
    Department of Physics, Graduate School of Science, Kyoto University
  • Michioka Chishiro
    Department of Chemistry, Graduate School of Science, Kyoto University
  • Kato Masaki
    Department of Chemistry, Graduate School of Science, Kyoto University
  • Itoh Yutaka
    Department of Chemistry, Graduate School of Science, Kyoto University
  • Yoshimura Kazuyoshi
    Department of Chemistry, Graduate School of Science, Kyoto University
  • Takada Kazunori
    Advanced Materials Laboratory, National Institute for Materials Science
  • Sasaki Takayoshi
    Advanced Materials Laboratory, National Institute for Materials Science
  • Sakurai Hiroya
    Superconducting Materials Center, National Institute for Materials Science
  • Takayama-Muromachi Eiji
    Superconducting Materials Center, National Institute for Materials Science

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タイトル別名
  • Anisotropic Behavior of Knight Shift in Superconducting State of NaxCoO2·yH2O
  • Anisotropic Behavior of Knight Shift in Superconducting State of Na<sub><i>x</i></sub>CoO<sub>2</sub>·<i>y</i>H<sub>2</sub>O

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The Co Knight shift was measured in an aligned powder sample of NaxCoO2·yH2O, which shows superconductivity at Tc∼4.6 K. The Knight-shift components parallel (Kc) and perpendicular to the c-axis (along the ab plane Kab) were measured in both the normal and superconducting (SC) states. The temperature dependences of Kab and Kc 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: Kab decreases below 5 K, whereas Kc 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 NaxCoO2·yH2O.

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