Abstract
Based on the model that was successfully applied to KC 8 , RbC 8 , and CsC 8 in 1982, we have calculated superconducting transition temperature T c for CaC 6 and YbC 6 to find that the same model reproduces observed T c in those compounds as well, indicating that it is a standard model for superconductivity in graphite intercalation compounds with T c ranging over three orders of magnitude. Further enhancement of T c well beyond 10 K is also predicted. The present method for calculating T c from first principles is compared with that in the density functional theory for superconductors, by paying attention to the feature of determining T c without resort to the concept of the Coulomb pseudopotential μ*.
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