Field dependence of the vortex core size in a multi-band superconductor

Details Field dependence of the vortex core size in a multi-band superconductor Field dependence of the vortex core size in a multi-band superconductor

2005-06-04

arxiv.org/abs/cond-mat/0506096v2

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures. Version accepted for publication in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.95.197001

The magnetic field dependence of the vortex core size in the multi-band superconductor NbSe2 has been determined from muon spin rotation measurements. The spatially extended nature of the quasiparticle core states associated with the smaller gap leads to a rapid field-induced shrinkage of the core size at low fields, while the more tightly bound nature of the states associated with the larger gap leads to a field-independent core size for fields greater than 4 kOe. A simple model is proposed for the density of delocalized core states that establishes a direct relationship between the field-induced reduction of the vortex core size and the corresponding enhancement of the electronic thermal conductivity. We show that this model accurately describes both NbSe2 and the single-band superconductor V3Si.

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