59Co-NQR study on superconducting NaxCoO2.yH2O

Yoshiaki Kobayashi; Mai Yokoi; Masatoshi Sato

doi:10.1143/JPSJ.72.2161

59Co-NQR study on superconducting NaxCoO2.yH2O

Superconductivity 2009-11-10 v2 Strongly Correlated Electrons

Authors: Yoshiaki Kobayashi , Mai Yokoi , Masatoshi Sato

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Abstract

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.

Keywords

NQR superconductivity NaxCoO2 nuclear spin relaxation magnetic susceptibility

Cite

@article{arxiv.cond-mat/0305649,
  title  = {59Co-NQR study on superconducting NaxCoO2.yH2O},
  author = {Yoshiaki Kobayashi and Mai Yokoi and Masatoshi Sato},
  journal= {arXiv preprint arXiv:cond-mat/0305649},
  year   = {2009}
}

Comments

7 pages, 5 figures. to be published in J. Phys. Soc. Jpn. 72 (2003) No.9

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