Unconventional upper- and lower-critical fields and normal-state magnetic susceptibility of the superconducting compound Na0.35CoO2⋅1.3H2O
Hiroya Sakurai, Kazunori Takada, Shunsuke Yoshii, Takayoshi Sasaki, Koichi Kindo, Eiji Takayama-Muromachi
DOI 10.1103/PhysRevB.68.132507 · Physical Review B
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Abstract
Magnetic properties of the layered superconductor, Na0.35CoO2⋅1.3H2O 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 TC=4.6K, HC2(0)=61.0T and HC1(0)=28.1Oe, respectively. These values give quite unusual phenomenological parameters, i.e., coherent length, penetration depth and Ginzburg-Landau parameter of ξ=2.32nm, λ=5.68×102nm, and κ≡λ/ξ=244, respectively, suggesting an unconventional nature of superconductivity. Additionally, the magnetic susceptibility above TC and the magnetization curve up to 54 T are also reported.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Na0.35CoO2*1.3H2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.6 | Pressure not reported | onset |
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