Observation of Bulk Superconductivity in NaxCoO2.yH2O and NaxCoO2.yD2O Powder and Single Crystals
Abstract
Poly- and single-crystalline NaxCoO2 has been successfully intercalated with H2O and D2O as confirmed by X-ray diffraction and thermogravimetric analysis. Resistivity, magnetic susceptibility, and specific heat measurements show bulk superconductivity with Tc close to 5 K in both cases. The substitution of deuterium for hydrogen has an effect on Tc of less than 0.2 K. Investigation of the resistivity anisotropy of NaxCoO2·yH2O single crystals shows: (a) almost zero resistivity below Tc, and (b) an abrupt upturn at T* 52 K in both the ab plane and the c direction. The implications of our results on the possible superconducting mechanism will be discussed.
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