Vortex core shrinkage in a two gap superconductor: application to MgB2
S. Graser, A. Gumann, T. Dahm, N. Schopohl
Abstract
As a model for the vortex core in MgB2 we study a two band model with a clean sigma band and a dirty pi band. We present calculations of the vortex core size in both bands as a function of temperature and show that there exists a Kramer-Pesch effect in both bands even though only one of the bands is in the clean limit. We present calculations for different pi band diffusivities and coherence lengths.
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