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.
Experimental evidence of s-wave superconductivity in bulk CaC6 / Lamura, G.; Aurino, M.; Cifariello, G.; DI GENNARO, E.; Andreone, Antonello; Emery, N.; Hrold, C.; March, J. F.; Lagrange, P.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 96:(2006), pp. 107005-1-107006-4. [10.1103/PhysRevLett.96.107008]
Experimental evidence of s-wave superconductivity in bulk CaC6
E. DI GENNARO;ANDREONE, ANTONELLO;
2006
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.| File | Dimensione | Formato | |
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