Journal
PHYSICAL REVIEW LETTERS
Volume 98, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.98.067003
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Funding
- EPSRC [EP/E003907/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/E003907/1] Funding Source: researchfish
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We report measurements of the in-plane electrical resistivity rho and thermal conductivity kappa of the intercalated graphite superconductor C(6)Yb 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.
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