μSR investigation of the intercalated graphite superconductor CaC6

Details μSR investigation of the intercalated graphite superconductor CaC6 μSR investigation of the intercalated graphite superconductor CaC6

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011njph...13a3038s&link_type=abstract

New Journal of Physics, Volume 13, Issue 1, pp. 013038 (2011).

Physics

1

Scientific paper

The superconducting properties of the graphite intercalation compound CaC6, available as high-quality c-axis-oriented polycrystals, were investigated through muon-spin spectroscopy measurements. An unconventional TF-μSR procedure, applicable to superconductors characterized by close-lying critical fields, was successfully adopted for measuring the muon-spin relaxation rates. Field-dependent measurements provide a value λab(0)=62(4) nm for the in-plane magnetic field penetration depth, κ=1.4(2) for the GL parameter, and hint at the presence of a slight gap anisotropy in the ab plane. The dependence of relaxation on temperature confirms the s-wave character of CaC6 superconductivity, with an average zero-temperature superconducting gap of 2.1(1) meV.

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