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
DOI 10.1103/PhysRevLett.98.067003 · Physical Review Letters
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Abstract
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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| C6Yb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| C6Ca Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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