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Unpaired electrons in the heavy-fermion superconductor CeCoIn5

  • Author(s): Tanatar, MA
  • Paglione, J
  • Nakatsuji, S
  • Hawthorn, DG
  • Boaknin, E
  • Hill, RW
  • Ronning, F
  • Sutherland, M
  • Taillefer, L
  • Petrovic, C
  • Canfield, PC
  • Fisk, Z
  • et al.
Abstract

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 Tc 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. © 2005 The American Physical Society.

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