The Current Carried by Bound States of a Superconducting Vortex
D. Rainer (Universitat Bayreuth), J. A. Sauls (Northestern University) and D. Waxman (University of Sussex)
- Date: June 23, 1996
Physical Review B 54, 10094 (1996)
We investigate the spectrum of quasiparticle excitations in the core of isolated pancake
vortices in clean layered superconductors. Analysis of the spectral current density shows
that both the circular current around the vortex center as well as any transport current
through the vortex core is carried by localized states bound to the core by Andreev scattering.
Hence the physical properties of the core are governed in clean high-κ superconductors (e.g.
the cuprate superconductors) by the Andreev bound states, and not by normal electrons as it
is the case for traditional (dirty) high-κ superconductors.
- Comment: 13 pages, 5 figures