Bulk evidence for single-gap s-wave superconductivity in the intercalated graphite superconductor C${}_6$Yb

Mike Sutherland, Nicolas Doiron-Leyraud, Louis Taillefer +3

We report measurements of the in-plane electrical resistivity $\rho$ and the thermal conductivity $\kappa$ of the intercalated graphite superconductor C${}_6$Yb to temperatures as low as $T_…