Coherent current states in a two-band superconductor

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)

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Cited by in corpus (12)

• Vortex matter in mesoscopic two-gap superconducting disks: influence of Josephson and magnetic coupling
• Soliton states in mesoscopic two-band-superconducting cylinders
• Proximity and Josephson effects in microstructures based on multiband superconductors
• Coexistence of giant Cooper pairs with a bosonic condensate and anomalous behavior of energy gaps in the BCS-BEC crossover of a two-band superfluid Fermi gas
• Optical response of the Leggett mode in multiband superconductors in the linear response regime
• Multiple-q current states in a multicomponent superconducting channel
• Magneto-topological transitions in multicomponent superconductors
• Soliton induced critical current oscillations in two-band superconducting bridges
• Collective excitations in two-band superconductors
• Unconventional and anomalous magnetic field distribution in a bilayer superconductor with geometric constraints
• Collective excitations in three-band superconductors
• Enhancing long-range order in disordered two-band s-wave superconductors