The thermal conductivity of the layered s-wave superconductor NbSe_2 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 most naturally explained as multi-band superconductivity, with distinct small and large superconducting gaps on different sheets of the Fermi surface.
@article{arxiv.cond-mat/0304499,
title = {Multiband superconductivity in NbSe_2 from heat transport},
author = {Etienne Boaknin and M. A. Tanatar and Johnpierre Paglione and D. G. Hawthorn and R. W. Hill and F. Ronning and M. Sutherland and Louis Taillefer and J. Sonier and S. M. Hayden and J. W. Brill},
journal= {arXiv preprint arXiv:cond-mat/0304499},
year = {2009}
}
Comments
2 pages, 2 figures, submitted to M2S-Rio 2003 Proceedings