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 = 4.6 K, HC2(0)=61.0 T and HC1(0)=28.1 Oe, respectively. These values give quite unusual phenomenological parameters, i.e., coherent length, penetration depth and Ginzburg-Landau parameter of ξ=2.32 nm, λ=5.68×102 nm, 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.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2003|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics