Muon Spin Rotation Study of the Intercalated Graphite Superconductor CaC6 at Low Temperatures

Autor: F. Murányi, Zurab Guguchia, Alexander Shengelaya, Markus Bendele, Chris Baines, H. U. Keller, Rustem Khasanov
Rok vydání: 2011
Předmět:
Zdroj: Journal of Superconductivity and Novel Magnetism. 25:159-163
ISSN: 1557-1947
1557-1939
DOI: 10.1007/s10948-011-1358-3
Popis: Muon spin rotation (μSR) experiments were performed on the intercalated graphite CaC6 in the normal and superconducting state down to 20 mK. In addition, AC magnetization measurements were carried out resulting in an anisotropic upper critical field \(H_{\text{c2}}\), from which the coherence lengths ξab(0)=36.3(1.5) nm and ξc(0)=4.3(7) nm were estimated. The anisotropy parameter \(\gamma _{H}=H_{\text{c2}}^{ab}/H_{\text{c2}}^{c}\) increases monotonically with decreasing temperature. A single isotropic s-wave description of superconductivity cannot account for this behavior. From magnetic field dependent μSR experiments, the absolute value of the in-plane magnetic penetration depth λab(0)=78(3) nm was determined. The temperature dependence of the superfluid density ρs(T) is slightly better described by a two-gap than a single-gap model.
Databáze: OpenAIRE
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