The thermal conductivity [Formula presented] of the layered [Formula presented]-wave superconductor [Formula presented] was measured down to [Formula presented] throughout the vortex state. With increasing field, we identify two regimes: one with localized states at fields very near [Formula presented] 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 [Formula presented] and the conventional superconductor [Formula presented].
|Number of pages||1|
|Journal||Physical Review Letters|
|State||Published - 2003|
ASJC Scopus subject areas
- Physics and Astronomy (all)