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Temperature (T) dependence of 59Co-NMR Knight shifts K of Na0.3CoO2.1.3H2Ohas been studied, where samples of randomly oriented powder and alignedcrystals 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 belowthe superconducting transition temperature Tc(H) with decreasing T, indicatingthat the superconducting electron pairs are in the singlet state. The uppercritical fields Hc2(T) determined from the K(H)-T curves are found to beconsistent with the values reported by the resistivity measurements for bothdirections of H.Comment: 8 pages, 6 figures, J.Phys. Soc. Jpn 74 (2005) No.

59Co-NMR Knight Shift of Aligned Crystals and Polycrystalline Samples of Superconducting Na0.3CoO2·1.3H2O

⁵⁹Co-NMR Knight Shift of Aligned Crystals and Polycrystalline Samples of Superconducting Na_0.3CoO₂·1.3H₂O