Muon spin rotation study of the magnetic penetration depth in the intercalated graphite superconductor CaC6

Details Muon spin rotation study of the magnetic penetration depth in the intercalated graphite superconductor CaC6 Muon spin rotation study of the magnetic penetration depth in the intercalated graphite superconductor CaC6

2008-03-31

arxiv.org/abs/0803.4513v3

Physics

Condensed Matter

Superconductivity

Accepted for publication in PRB

Scientific paper

We report temperature- and magnetic field-dependent bulk muon spin rotation measurements in a c-axis oriented superconductor CaC6 in the mixed state. Using both a simple second moment analysis and the more precise analytical Ginzburg-Landau model, we obtained a field independent in-plane magnetic penetration depth {\lambda}ab (0) = 72(3) nm. The temperature dependencies of the normalized muon spin relaxation rate and of the normalized superfluid density result to be identical, and both are well represented by the clean limit BCS model with 2\Delta/kB Tc = 3.6(1), suggesting that CaC6 is a fully gapped BCS superconductor in the clean limit regime.

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