  The intercalated graphite superconductor CaC6 with Tc ~ 11.5 K has been
synthesized and characterized with magnetoresistance measurements. Above the
transition, the resistivity follows a T^2 dependence up to 50 K, which suggests
Fermi liquid behavior. Above 50 K, the data can be fit to the Bloch-Gruneisen
model providing a Debye temperature of theta = 263 K. By using McMillan
formula, we estimate the electron-phonon coupling constant of lambda = 0.85
which places this material in the intermediate-coupling regime. The upper
critical field is determined parallel and perpendicular to the superconducting
planes, and the dependence of the upper critical field as a function of angle
suggests that this is a quasi-2D superconductivity. All of these measurements
are consistent with BCS-like superconductivity.
