Bulk evidence for single-gap s-wave superconductivity in the intercalated graphite superconductor C6Yb
Mike Sutherland, Nicolas Doiron-Leyraud, Louis Taillefer, Thomas Weller, Mark Ellerby, S. S. Saxena
Abstract
We report measurements of the in-plane electrical resistivity ρ and the thermal conductivity κ of the intercalated graphite superconductor C6Yb to temperatures as low as Tc/100. When a field is applied along the c-axis, the residual electronic linear term κ0/T evolves in an exponential manner for Hc1 < H < Hc2. This activated behaviour establishes the order parameter as unambiguously s-wave, and rules out the possibility of multi-gap or unconventional superconductivity in this system.
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