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

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

doi:10.1103/PhysRevLett.96.107008

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

Superconductivity 2009-11-11 v1

Authors: G. Lamura , M. Aurino , G. Cifariello , E. Di Gennaro , A. Andreone , N. Emery , C. Herold , J. -F. Mareche , P. Lagrange

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Abstract

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.

Keywords

s-wave superconductivity CaC$_{6}$ magnetic penetration depth BCS theory weakly coupled superconductor

Cite

@article{arxiv.cond-mat/0601339,
  title  = {Experimental evidence of s-wave superconductivity in bulk CaC$_{6}$},
  author = {G. Lamura and M. Aurino and G. Cifariello and E. Di Gennaro and A. Andreone and N. Emery and C. Herold and J. -F. Mareche and P. Lagrange},
  journal= {arXiv preprint arXiv:cond-mat/0601339},
  year   = {2009}
}

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To appear in Phys. Rev. Lett

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

Abstract

Keywords

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