Abstract
The thermal conductivity of the layered -wave superconductor was measured down to throughout the vortex state. With increasing field, we identify two regimes: one with localized states at fields very near 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 and the conventional superconductor .
- Received 15 November 2002
DOI:https://doi.org/10.1103/PhysRevLett.90.117003
©2003 American Physical Society