^<59>Co-NMR Knight Shift of Aligned Crystals and Polycrystalline Samples of Superconducting Na_<0.3>CoO_2・1.3H_2O(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)

概要

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The temperature (T) dependence of the ^<59>Co-NMR Knight shifts K of Na_<0.3>CoO_2・1.3H_2O 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 T_c(H) with decreasing T, indicating that the superconducting electron pairs are in the singlet state. The upper critical fields H_<c2>(T) determined from the K(H)-T curves are found to be consistent with the values reported from the resistivity measurements for both directions of H.
社団法人日本物理学会の論文
2005-06-15