title: Low temperature limit of the vortex core radius and the kramer-pesch effect in NbSe2
abstract: Muon spin rotation ( &mgr;SR) has been used to measure the magnetic field distribution in the vortex state of the type-II superconductor NbSe2 ( T(c) = 7.0 K) below T = 2 K. The distribution is consistent with a highly ordered hexagonal vortex lattice with a well resolved high-field cutoff associated with the finite size of the vortex cores. The temperature dependence of the core radius is much weaker than the temperature dependence predicted from the Bogoliubov-de Gennes theory. Furthermore, the vortex radius measured by &mgr;SR near the low temperature quantum limit is about an order of magnitude larger than predicted.
authors.affiliation: TRIUMF, 4004 Westbrook Mall, Vancouver, British Columbia V6T 2A3, Canada.
authors.initials: RI
authors.lastname: Miller
authors.initials: RF
authors.lastname: Kiefl
authors.initials: JH
authors.lastname: Brewer
authors.initials: J
authors.lastname: Chakhalian
authors.initials: S
authors.lastname: Dunsiger
authors.initials: GD
authors.lastname: Morris
authors.initials: JE
authors.lastname: Sonier
authors.initials: WA
authors.lastname: MacFarlane