%0 Journal Article
%@ 0031-9007
%A Sutherland, M
%A Doiron-Leyraud, N
%A Taillefer, L
%A Weller, T
%A Ellerby, M
%A Saxena, SS
%D 2007
%F discovery:116271
%I AMERICAN PHYSICAL SOC
%J PHYS REV LETT
%K THERMAL-CONDUCTIVITY, FIELD, STATE, MODEL
%N 6
%T Bulk evidence for single-gap s-wave superconductivity in the intercalated graphite superconductor C6Yb
%U https://discovery.ucl.ac.uk/id/eprint/116271/
%V 98
%X We report measurements of the in-plane electrical resistivity rho and thermal conductivity kappa of the intercalated graphite superconductor C6Yb down to temperatures as low as T-c/100. When a field is applied along the c axis, the residual electronic linear term kappa(0)/T evolves in an exponential manner for H-c1 < H < H-c2/2. This activated behavior is compelling evidence for an s-wave order parameter, and is a strong argument against the possible existence of multigap superconductivity.
%Z © 2007 The American Physical Society