Multiband superconductivity in NbSe2 from heat transport
Etienne Boaknin, M. A. Tanatar, Johnpierre Paglione, D. G. Hawthorn, R. W. Hill, F. Ronning, M. Sutherland, Louis Taillefer, J. Sonier, S. M. Hayden, J. W. Brill
Abstract
The thermal conductivity 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 most naturally explained as multi-band superconductivity, with distinct small and large superconducting gaps on different sheets of the Fermi surface.
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