Experimental Evidence of s-Wave Superconductivity in Bulk CaC6

G. Lamura; M. Aurino; G. Cifariello; E. Di Gennaro; A. Andreone; N. Emery; C. Hérold; J.-F. Marêché; P. Lagrange

doi:10.1103/PhysRevLett.96.107008

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Experimental Evidence of s-Wave Superconductivity in Bulk CaC6

G. Lamura, M. Aurino, G. Cifariello, E. Di Gennaro, A. Andreone, N. Emery, C. Hérold, J.-F. Marêché, P. Lagrange

DOI 10.1103/PhysRevLett.96.107008 · Physical Review Letters

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Abstract

The temperature dependence of the in-plane magnetic penetration depth, λab(T), has been measured in a c-axis oriented polycrystalline CaC6 bulk sample using a high-resolution mutual inductance technique. A clear exponential behavior of λab(T) has been observed at low temperatures, strongly suggesting isotropic s-wave pairing. Data fit using the standard BCS theory yields λab(0)=(720±80) Å and Δ(0)=(1.79±0.08) meV. The ratio 2Δ(0)/kBTc=(3.6±0.2) gives indication for a weakly coupled superconductor.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
CaC6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	11.46	Pressure not reported	onset
YbC6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	6.5	Pressure not reported	unknown