23Na NMR Study of Layered Superconductor NaxCoO2- yH2O
Abstract
We measured 23Na-NMR spectra and nuclear spin-lattice relaxation rates 23(1/T1) of superconducting and non-superconducting bilayer hydrate NaxCoO2-yH2O (x ~ 0.3, y ~ 1.3). The central resonance frequency shows a small but various shift due to the difference in the shielding effect by intercalated H2O molecules. The different shielding effect also gives a large difference in the magnitude of 23(1/T1).
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