Abstract
We found two components of the in-plane Co 59 NMR Knight shift K and different nuclear spin–lattice relaxation rates 1 / T 1 in bilayer hydrated superconductor Na x CoO 2 · y H 2 O , an oriented powder sample by a magnetic field in Fluorinert FC70. Distinguishable two peaks in the central transition line of the Co 59 NMR spectrum at 10 K can be explained by an anisotropic Knight shift in a triangular plane. The hyperfine coupling constants seem to change around 150 K, in which the bulk susceptibility χ shows a broad minimum, suggesting a change of the electronic state in the CoO 2 plane.
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