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

Brock University; Canada); F. S. Razavi (2) ((1) Max-Planck-Institut fuer Festkoerperforschung; Germany (2) Department of Physics; J. S. Kim (1); L. Boeri (1); Ontario; R. K. Kremer (1); Stuttgart

arxiv: cond-mat/0603539 · v1 · submitted 2006-03-21 · ❄️ cond-mat.supr-con · cond-mat.mtrl-sci

Specific Heat of the Ca-Intercalated Graphite Superconductor CaC₆

J. S. Kim (1) , R. K. Kremer (1) , L. Boeri (1) , F. S. Razavi (2) ((1) Max-Planck-Institut fuer Festkoerperforschung , Stuttgart , Germany (2) Department of Physics , Brock University , Ontario

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classification ❄️ cond-mat.supr-con cond-mat.mtrl-sci

keywords heatspecificsuperconductingca-intercalatedcac6graphiteanomalyapproach

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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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Specific Heat of the Ca-Intercalated Graphite Superconductor CaC₆

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