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

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72 Citations (Scopus)

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 = 4.6 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.

Original languageEnglish
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume68
Issue number13
DOIs
Publication statusPublished - 2003

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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