Experimental evidence of s-wave superconductivity in bulk CaC$_{6}$

Details Experimental evidence of s-wave superconductivity in bulk CaC$_{6}$ Experimental evidence of s-wave superconductivity in bulk CaC$_{6}$

2006-01-16

arxiv.org/abs/cond-mat/0601339v1

Physics

Condensed Matter

Superconductivity

To appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.96.107008

The temperature dependence of the in-plane magnetic penetration depth, $\lambda_{ab}(T)$, has been measured in a c-axis oriented polycrystalline CaC$_{6}$ bulk sample using a high-resolution mutual inductance technique. A clear exponential behavior of $\lambda_{ab}(T)$ has been observed at low temperatures, strongly suggesting isotropic s-wave pairing. Data fit using the standard BCS theory yields $\lambda_{ab}(0)=(720\pm 80)$ Angstroem and $\Delta(0)=(1.79\pm 0.08)$ meV. The ratio $2\Delta(0)/k_{_B}T_{c}=(3.6\pm 0.2)$ gives indication for a conventional weakly coupled superconductor.

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