Phys. Rev. Lett. 98, 067003 (2007) [4 pages]Bulk Evidence for Single-Gap s-Wave Superconductivity in the Intercalated Graphite Superconductor C6YbReceived 24 March 2006; published 6 February 2007 We report measurements of the in-plane electrical resistivity ρ and thermal conductivity κ of the intercalated graphite superconductor C6Yb down 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<Hc2/2. This activated behavior is compelling evidence for an s-wave order parameter, and is a strong argument against the possible existence of multigap superconductivity. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.067003
DOI:
10.1103/PhysRevLett.98.067003
PACS:
74.70.Wz, 74.25.Fy, 74.25.Op
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