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Multiband superconductivity in NbSe₂ from heat transport

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arxiv cond-mat/0304499 v1 pith:SDZ3UOAH submitted 2003-04-22 cond-mat.supr-con cond-mat.str-el

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
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J. Sonier S.M. Hayden J.W. Brill
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classification cond-mat.supr-con cond-mat.str-el
keywords fieldsnbsesuperconductivityassociatedconductivitydelocalizeddifferentdistinct
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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.

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