Specific Heat of the Ca-Intercalated Graphite Superconductor CaC$_6$

J. S. Kim; R. K. Kremer; L. Boeri; F. S. Razavi

doi:10.1103/PhysRevLett.96.217002

Specific Heat of the Ca-Intercalated Graphite Superconductor CaC$_6$

Superconductivity 2009-11-11 v1 Materials Science

Authors: J. S. Kim , R. K. Kremer , L. Boeri , F. S. Razavi

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Abstract

The superconducting state of Ca-intercalated graphite CaC6 has been investigated by specific heat measurements. The characteristic anomaly at the superconducting transition (Tc = 11.4 K) indicates clearly the bulk nature of the superconductivity. The temperature and magnetic field dependence of the electronic specific heat are consistent with a fully-gapped superconducting order parameter. The estimated electron-phonon coupling constant is lambda = 0.60 - 0.74 suggesting that the relatively high Tc of CaC6 can be explained within the weak-coupling BCS approach.

Keywords

Ca-intercalated graphite superconductivity specific heat electron-phonon coupling BCS theory CaC6

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@article{arxiv.cond-mat/0603539,
  title  = {Specific Heat of the Ca-Intercalated Graphite Superconductor CaC$_6$},
  author = {J. S. Kim and R. K. Kremer and L. Boeri and F. S. Razavi},
  journal= {arXiv preprint arXiv:cond-mat/0603539},
  year   = {2009}
}

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4 pages, 4 figs, submitted to Phys. Rev. Lett

Specific Heat of the Ca-Intercalated Graphite Superconductor CaC$_6$

Abstract

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