Heat Conduction in the Vortex State of NbSe2: Evidence for Multiband Superconductivity

Etienne Boaknin, M. A. Tanatar, Johnpierre Paglione, D. Hawthorn, F. Ronning, R. W. Hill, M. Sutherland, Louis Taillefer, Jeff Sonier, S. M. Hayden, and J. W. Brill
Phys. Rev. Lett. 90, 117003 – Published 18 March 2003

Abstract

The thermal conductivity κ of the layered s-wave superconductor NbSe2 was measured down to Tc/100 throughout the vortex state. With increasing field, we identify two regimes: one with localized states at fields very near Hc1 and one with highly delocalized quasiparticle excitations at higher fields. The two associated length scales are naturally explained as multiband superconductivity, with distinct small and large superconducting gaps on different sheets of the Fermi surface. This behavior is compared to that of the multiband superconductor MgB2 and the conventional superconductor V3Si.

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  • Received 15 November 2002

DOI:https://doi.org/10.1103/PhysRevLett.90.117003

©2003 American Physical Society

Authors & Affiliations

Etienne Boaknin1, M. A. Tanatar1, Johnpierre Paglione1, D. Hawthorn1, F. Ronning1, R. W. Hill1, M. Sutherland1, Louis Taillefer1,2, Jeff Sonier2,3, S. M. Hayden4, and J. W. Brill5

  • 1Department of Physics, University of Toronto, Toronto, Ontario, Canada
  • 2Canadian Institute for Advanced Research, Toronto, Ontario, Canada
  • 3Department of Physics, Simon Fraser University, Burnaby, Canada
  • 4H. H. Wills Physics Laboratory, University of Bristol, Bristol BS8 1TL, United Kingdom
  • 5Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky, 40506-0055

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Issue

Vol. 90, Iss. 11 — 21 March 2003

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