<sup>59</sup>Co NQR Study on Superconducting Na<sub><i>x</i></sub>CoO<sub>2</sub>·<i>y</i>H<sub>2</sub>O

DOI DOI Web Site Web Site BIBCODE 被引用文献26件 参考文献34件 オープンアクセス
  • Kobayashi Yoshiaki
    Department of Physics, Division of Material Science, Nagoya University
  • Yokoi Mai
    Department of Physics, Division of Material Science, Nagoya University
  • Sato Masatoshi
    Department of Physics, Division of Material Science, Nagoya University

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タイトル別名
  • 59Co NQR Study on Superconducting NaxCoO2 yH2O

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説明

Layered Co oxide NaxCoO2·yH2O with a superconducting transition temperature Tc=4.5 K has been studied by 59Co NQR. The nuclear spin relaxation rate 1⁄59T1 is nearly proportional to temperature T in the normal state. In the superconducting state, it exhibits the coherence peak and decreases with decreasing T below ∼0.8Tc. Detailed comparison of the 1⁄T1T values and the magnetic susceptibilities between NaxCoO2·yH2O and NaxCoO2 implies that the metallic state of the former system is closer to a ferromagnetic phase than that of the latter. These experimental results impose a restriction on the mechanism of the superconductivity.

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