Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2003-06-26
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages; 5 figures; new data in figures; revised and updated text
Scientific paper
10.1103/PhysRevLett.92.157004
Superconducting single crystal samples of Na_xCoO_2 + yH_2O have been produced using an electrochemical technique which dispenses with the usual bromine chemical de-intercalation step and permits much more precise control of the Na content. After careful hydration, nearly single-phase crystals have been obtained in which over 90% of the sample's volume corresponds to the superconducting Na_{0.3}CoO_2 + 1.3H_2O structure. 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 H||c and H||ab reveal significant anisotropy. The estimated value of H_{c2} for H||c yields a coherence length of ~100 A, consistent with an extremely narrow bandwidth.
Abel E. T.
Cho Jin-Ho
Chou Fang-Chieh
Lee Patrick A.
Lee Young Sam
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