corner
corner
APS » Journals » Phys. Rev. Lett. » Volume 95 » Issue 6
< Previous Article | Next Article >

Phys. Rev. Lett. 95, 067002 (2005) [4 pages]

Unpaired Electrons in the Heavy-Fermion Superconductor CeCoIn5

Download: PDF (393 kB) Buy this article Export: BibTeX or EndNote (RIS)

M. A. Tanatar1,*, Johnpierre Paglione1,†, S. Nakatsuji2, D. G. Hawthorn1,‡, E. Boaknin1,§, R. W. Hill1,**, F. Ronning1,††, M. Sutherland1,‡‡, Louis Taillefer1,3,4, C. Petrovic5, P. C. Canfield6, and Z. Fisk4,7
1Department of Physics, University of Toronto, Toronto, Ontario, Canada
2Department of Physics, Kyoto University, Kyoto 606-8502, Japan
3Regroupement Québécois sur les Matériaux de Pointe, Département de physique, Université de Sherbrooke, Sherbrooke, Canada
4Canadian Institute for Advanced Research, Toronto, Ontario, Canada
5Department of Physics, Brookhaven National Laboratory, Upton, New York 11973, USA
6Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
7Department of Physics, University of California, Davis, Davis, CA 95616, USA

Received 11 March 2005; published 5 August 2005

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

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.95.067002
DOI:
10.1103/PhysRevLett.95.067002
PACS:
74.70.Tx, 72.15.Eb, 74.20.Rp

*Electronic address: tanatar@ims.ac.jp

Permanent address: Inst. Surface Chemistry, N.A.S. Ukraine, Kyiv, Ukraine.

†Present address: Department of Physics, University of California, San Diego, La Jolla, CA, USA.

‡Present address: Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, Canada.

§Present address: Department of Physics, Yale University, New Haven, CT, USA.

**Present address: Department of Physics, University of Waterloo, Waterloo, Canada.

††Present address: Los Alamos National Lab, MST-10 Division, Los Alamos, NM, USA.

‡‡Present address: Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom.

 
< Previous Article | Next Article >