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

• 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

Bibliographic Information

Other Title

• Anisotropic Behavior of Knight Shift in Superconducting State of NaxCoO2・yH2O
• Anisotropic Behavior of Knight Shift in Superconducting State of Na_<i>x</i>CoO₂·<i>y</i>H₂O

Abstract

The Co Knight shift was measured in an aligned powder sample of Na_xCoO₂·yH₂O, which shows superconductivity at T_c∼4.6 K. 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 5 K, 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_xCoO₂·yH₂O.

Journal

• Journal of the Physical Society of Japan

  Journal of the Physical Society of Japan 75 (1), 013708-, 2006

  THE PHYSICAL SOCIETY OF JAPAN

Keywords

• superconductivity
• hydrate sodium cobalt oxide
• NMR
• spin fluctuations

Details

• CRID: 1390001204189863936
• NII Article ID: 110003482820
• NII Article ID: 210000105946
• NII Book ID: AA00704814
• DOI: 10.1143/jpsj.75.013708
• BIBCODE: 2006JPSJ...75a3708I
• ISSN: 13474073
• ISSN: 00319015
• NDL BIB ID: 7772014
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I7772014
• Web Site: http://journals.jps.jp/doi/pdf/10.1143/JPSJ.75.013708
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed