Thermodynamic and transport measurements of superconducting Na0.3CoO2•1.3H2O single crystals prepared by electrochemical deintercalation -: art. no. 157004

Superconducting single crystal samples of Na0.3CoO2.1.3H(2)O have been produced using an electrochemical technique which dispenses with the usual bromine chemical deintercalation method. In fully hydrated crystals, susceptibility and specific heat measurements confirm that bulk superconductivity has been achieved. The extracted normal state density of states indicates Fermi-liquid behavior with strong mass enhancement and a modest Wilson ratio. Measurements of H-c2 for Hparallel toc and Hparallel toab reveal significant anisotropy, and the extracted value for the coherence length is about 100 angle, consistent with an extremely narrow bandwidth.