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²³Na NMR Study of Layered Superconductor Na_xCoO₂- yH₂O

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arxiv cond-mat/0507081 v2 pith:XRIH3ENL submitted 2005-07-04 cond-mat.supr-con

$^{23}$Na NMR Study of Layered Superconductor $Na_xCoO_2- yH_2O$

H. Ohta , C. Michioka , Y. Itoh , K. Yoshimura , H. Sakurai , E. Takayama-Muromachi , K. Takada , T. Sasaki This is my paper
classification cond-mat.supr-con
keywords differenceeffectshieldingxcoobilayercentraldifferentfrequency
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abstract

We measured $^{23}$Na-NMR spectra and nuclear spin-lattice relaxation rates $^{23}(1/T_1)$ of superconducting and non-superconducting bilayer hydrate $Na_xCoO_2-yH_2O$ (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 $H_2O$ molecules. The different shielding effect also gives a large difference in the magnitude of $^{23}(1/T_1)$.

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