Electric field around the vortex in superconductors
Abstract
Due to the particle hole asymmetry the superconducting properties depend on the chemical potential. This leads to an additional hydrodynamic contribution to the Hall conductivity which can produce a sign change of the Hall effect [Phys. Rev. Lett. 75, 3736 (1995)]. Another aspect of this phenomenon is the variation of the order parameter in a vortex leading to a radial electric field in the superconductor even for a vortex at rest. Inside the superconductor the change of the scalar potential is compensated by the change of the chemical potential. Outside the superconductor the electric field around the vortex is dipole like with \varphi=(1/π^2em) (partialln T_c/partiallnμ)ln(z/ξ)z/(z^2+r^2)^3/2 (within a BCS approach. Measuring this field one would be able to observe the vortex structure at high fields where conventional techniques can not be applied.
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 1996
- Bibcode:
- 1996APS..MAR.Q3610G