Coherent current states in a two-band superconductor
arXiv:cond-mat/0611085 · doi:10.1063/1.2737547
Abstract
Homogeneous current states in thin films and Josephson current in superconducting microbridges are studied within the frame of a two-band Ginzburg-Landau theory. By solving the coupled system of equations for two order parameters the depairing current curves and Josephson current-phase relation are calculated for different values of phenomenological parameters gamma and eta. Coefficients gamma and eta describe the coupling of order parameters (proximity effect) and their gradients (drag effect) respectively. For definite values of parameters the dependence of current j on superfluid momentum contains local minimum and corresponding bi-stable states. It is shown that the Josephson microbridge from two-band superconductor can demonstrate pi-junction behaviour.
19 pages, 6 figures (some references are corrected and added)
References in corpus (5)
- A superconductor to superfluid phase transition in liquid metallic hydrogen
- Ginzburg-Landau theory of vortices in a multi-gap superconductor
- Limits of the upper critical field in dirty two-gap superconductors
- Phase textures induced by dc current pairbreaking in multilayer structures and two-gap superconductors
- Fermi surface topology and vortex state in MgB2