Specific heat of the Ca-intercalated graphite superconductor CaC6.

  title={Specific heat of the Ca-intercalated graphite superconductor CaC6.},
  author={Jinyoung Serena Kim and Reinhard K Kremer and Lilia Boeri and Fereidoon Saadatmand Razavi},
  journal={Physical review letters},
  volume={96 21},
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 = 0.70 +/- 0.04, suggesting that the relatively… CONTINUE READING