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

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

2006-03-21

arxiv.org/abs/cond-mat/0603539v1

Physics

Condensed Matter

Superconductivity

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

Scientific paper

10.1103/PhysRevLett.96.217002

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.

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