Low temperature limit of the vortex core radius and the kramer-pesch effect in NbSe2
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.
Miller
RI
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Kiefl
RF
Brewer
JH
Chakhalian
J
Dunsiger
S
Morris
GD
Sonier
JE
MacFarlane
WA