title: Heat conduction in the vortex state of NbSe2: evidence for multiband superconductivity.
abstract: The thermal conductivity kappa of the layered s-wave superconductor NbSe2 was measured down to T(c)/100 throughout the vortex state. With increasing field, we identify two regimes: one with localized states at fields very near H(c1) 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.
authors.affiliation: Department of Physics, University of Toronto, Toronto, Ontario, Canada.
authors.forename: Etienne
authors.initials: E
authors.lastname: Boaknin
authors.forename: M A
authors.initials: MA
authors.lastname: Tanatar
authors.forename: Johnpierre
authors.initials: J
authors.lastname: Paglione
authors.forename: D
authors.initials: D
authors.lastname: Hawthorn
authors.forename: F
authors.initials: F
authors.lastname: Ronning
authors.forename: R W
authors.initials: RW
authors.lastname: Hill
authors.forename: M
authors.initials: M
authors.lastname: Sutherland
authors.forename: Louis
authors.initials: L
authors.lastname: Taillefer
authors.forename: Jeff
authors.initials: J
authors.lastname: Sonier
authors.forename: S M
authors.initials: SM
authors.lastname: Hayden
authors.forename: J W
authors.initials: JW
authors.lastname: Brill