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6. The role of the water molecules in novel superconductor, Na0.35CoO2 · 1.3H2O

Author

Sakurai, H., Takada, K., Izumi, F., Dilanian, R.A., Sasaki, T., and Takayama-Muromachi, E.

Subjects
*ELECTRIC fields, *INTERMEDIATES (Chemistry), *SUPERCONDUCTIVITY, *COULOMB potential
Abstract

In order to investigate the role of the water molecules in Na0.35CoO2 · 1.3H2O, we synthesized superconducting Na0.35CoO2 · 1.3H2O and nonsuperconducting Na0.35CoO2 · 0.7H2O, and measured their normal-state magnetic susceptibilities. The susceptibility of Na0.35CoO2 · 1.3H2O has an enhancement below ∼150 K probably caused by ferromagnetic fluctuation, whereas no such enhancement was observed in Na0.35CoO2 · 0.7H2O. The water molecules in Na0.35CoO2 · 1.3H2O may work to shield random coulomb potential of the Na ions with smoother potential at the CoO2 layer. This effect may account for the appearance of superconductivity in Na0.35CoO2 · 1.3H2O. [Copyright &y& Elsevier]

Published
2004
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