Journal
PHYSICAL REVIEW LETTERS
Volume 95, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.95.067002
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Thermal conductivity and specific heat were measured in the superconducting state of the heavy-fermion material Ce1-xLaxCoIn5. With increasing impurity concentration x, the suppression of T-c is accompanied by the increase in residual electronic specific heat expected of a d-wave superconductor, but it occurs in parallel with a decrease in residual electronic thermal conductivity. This contrasting behavior reveals the presence of uncondensed electrons coexisting with nodal quasiparticles. An extreme multiband scenario is proposed, with a d-wave superconducting gap on the heavy-electron sheets of the Fermi surface and a negligible gap on the light, three-dimensional pockets.
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