corner
corner
APS » Journals » Phys. Rev. Lett. » Volume 90 » Issue 11
< Previous Article | Next Article >

Phys. Rev. Lett. 90, 117003 (2003) [4 pages]

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

Download: PDF (146 kB) Buy this article Export: BibTeX or EndNote (RIS)

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

Received 15 November 2002; published 18 March 2003

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.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.90.117003
DOI:
10.1103/PhysRevLett.90.117003
PACS:
74.70.Ad, 74.25.Fy, 74.25.Jb, 74.25.Qt
 
< Previous Article | Next Article >