Abstract
In order to investigate the role of the water molecules in Na 0.35CoO 2 · 1.3H 2O, we synthesized superconducting Na 0.35CoO 2 · 1.3H 2O and nonsuperconducting Na 0.35CoO 2 · 0.7H 2O, and measured their normal-state magnetic susceptibilities. The susceptibility of Na 0.35CoO 2 · 1.3H 2O has an enhancement below ∼150 K probably caused by ferromagnetic fluctuation, whereas no such enhancement was observed in Na 0.35CoO 2 · 0.7H 2O. The water molecules in Na 0.35CoO 2 · 1.3H 2O may work to shield random coulomb potential of the Na ions with smoother potential at the CoO 2 layer. This effect may account for the appearance of superconductivity in Na 0.35CoO 2 · 1.3H 2O.
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