59Co-NQR study on superconducting NaxCoO2.yH2O

Details 59Co-NQR study on superconducting NaxCoO2.yH2O 59Co-NQR study on superconducting NaxCoO2.yH2O

2003-05-28

arxiv.org/abs/cond-mat/0305649v2

J, Phys. Soc. Jpn. 73 (2003) 2161.

Physics

Condensed Matter

Superconductivity

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

Scientific paper

10.1143/JPSJ.72.2161

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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