Journal
PHYSICAL REVIEW B
Volume 68, Issue 13, Pages -Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevB.68.132507
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Magnetic properties of the layered superconductor, Na0.35CoO2.1.3H(2)O have been investigated. From the temperature dependence and field dependence of the magnetization, the superconducting transition temperature, as well as upper- and lower-critical fields have been estimated to be T-C=4.6 K, H-C2(0)=61.0 T and H-C1(0)=28.1 Oe, respectively. These values give quite unusual phenomenological parameters, i.e., coherent length, penetration depth and Ginzburg-Landau parameter of xi=2.32 nm, lambda=5.68x10(2) nm, and kappaequivalent tolambda/xi=244, respectively, suggesting an unconventional nature of superconductivity. Additionally, the magnetic susceptibility above T-C and the magnetization curve up to 54 T are also reported.
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