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Layered Co oxide NaxCoO2.yH2O with the superconducting transition temperatureTc =4.5 K has been studied by 59Co-NMR. The Knight shift K estimated from theobserved spectra for powder sample exhibits almost temperature(T)-independentbehavior above Tc and decreases with decreasing T below Tc. This result and theexistence of the coherence peak in the spin-lattice-relaxation-rate versus Tcurve reported by the present authors indicate, naively speaking, that thesinglet order parameter with s-wave symmetry is realized in NaxCoO2.yH2O.Differences of the observed behaviors between the spectra of the non-alignedsample and the one aligned in epoxy adhesive by applying the external magneticfield are discussed.Comment: 6 pages, 4 figures, submitted to J. Phys. Soc. Jp

59Co-NMR Knight Shift of Superconducting NaxCoO2·yH2O

⁵⁹Co-NMR Knight Shift of Superconducting Na_xCoO₂·yH₂O