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Muon spin rotation (muSR) experiments were performed on the intercalatedgraphite CaC6 in the normal and superconducting state down to 20 mK. Inaddition, AC magnetization measurements were carried out resulting in ananisotropic upper critical field Hc2, from which the coherence lengthsxi_ab(0)=36.3(1.5) nm and xi_c(0)=4.3(7) nm were estimated. The anisotropyparameter gamma_H= H_c2_ab/H_c2_c increases monotonically with decreasingtemperature. A single isotropic s-wave description of superconductivity cannotaccount for this behaviour. From magnetic field dependent muSR experiments theabsolute value of the in-plane magnetic penetretion depth lambda_ab=78(3) nmwas determined. The temperature dependence of the superfluid density rho_s(T)is slightly better described by a two-gap than a single-gap model.

Muon spin rotation study of the intercalated graphite superconductor CaC6 at low temperatures