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

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

2006-03-24

arxiv.org/abs/cond-mat/0603664v1

Physics

Condensed Matter

Superconductivity

4 pages, 4 figs, submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.98.067003

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 $T_c$/100. When a field is applied along the c-axis, the residual electronic linear term $\kappa_0/T$ evolves in an exponential manner for $H_{c1} < H < H_{c2}$. 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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