Phys. Rev. Lett. 92, 157004 (2004) [4 pages]Thermodynamic and Transport Measurements of Superconducting Na0.3CoO2·1.3H2O Single Crystals Prepared by Electrochemical DeintercalationReceived 27 June 2003; published 15 April 2004 Superconducting single crystal samples of Na0.3CoO2·1.3H2O 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 Hc2 for H∥c and H∥ab reveal significant anisotropy, and the extracted value for the coherence length is about 100 Å, consistent with an extremely narrow bandwidth. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.92.157004
DOI:
10.1103/PhysRevLett.92.157004
PACS:
74.70.–b, 74.25.Bt, 74.25.Fy, 74.62.Bf
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