Physics – Condensed Matter – Superconductivity
Scientific paper
2004-12-17
J. Phys. Soc. Jpn. 74 (2005) No.6 1800.
Physics
Condensed Matter
Superconductivity
8 pages, 6 figures, J.Phys. Soc. Jpn 74 (2005) No.6
Scientific paper
10.1143/JPSJ.74.1800
Temperature (T) dependence of 59Co-NMR Knight shifts K of Na0.3CoO2.1.3H2O has been studied, where samples of randomly oriented powder and aligned crystals have been used for the applied magnetic fields H // ab plane and H //c-axis, respectively. For both directions of H, the shift K decreases below the superconducting transition temperature Tc(H) with decreasing T, indicating that the superconducting electron pairs are in the singlet state. The upper critical fields Hc2(T) determined from the K(H)-T curves are found to be consistent with the values reported by the resistivity measurements for both directions of H.
Kobayashi Yoshiaki
Mori Yoshihiko
Moyoshi Taketo
Sato* Masatoshi
Watanabe Hidekazu
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