Specific Heat of the Ca-Intercalated Graphite Superconductor CaC$_6$
J. S. Kim (1), R. K. Kremer (1), L. Boeri (1), and F. S. Razavi (2), ((1) Max-Planck-Institut fuer Festkoerperforschung, Stuttgart, Germany (2), Department of Physics, Brock University, Ontario, Canada)
TL;DR
This study investigates the superconducting properties of CaC6, revealing a bulk, fully-gapped superconducting state with a transition temperature of 11.4 K, explained by weak-coupling BCS theory.
Contribution
It provides detailed specific heat measurements confirming the bulk superconductivity and characterizes the superconducting gap and electron-phonon coupling in CaC6.
Findings
Superconducting transition at 11.4 K confirmed by specific heat anomaly
Electronic specific heat indicates a fully-gapped superconductor
Electron-phonon coupling constant estimated between 0.60 and 0.74
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.
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