Magnetic interference patterns in superconducting junctions: Effects of anharmonic current-phase relations
Institute of Solid State Physics, Russian Academy of Sciences - Chernogolovka, Moscow District, 142432 Russia
Accepted: 21 July 2010
A microscopic theory of the magnetic-field modulation of critical currents is developed for plane Josephson junctions with anharmonic current-phase relations. The results obtained allow examining temperature-dependent deviations of the modulation from the conventional interference pattern. For tunneling through localized states in symmetric short junctions with a pronounced anharmonic behavior, the deviations are obtained and shown to depend on the distribution of channel transparencies. For constant transparency the deviations vanish not only near Tc, but also at T=0. If Dorokhov bimodal distribution for transparency eigenvalues holds, the averaged deviation increases with decreasing temperature and takes its maximum at T=0.
PACS: 74.50.+r – Tunneling phenomena; Josephson effects / 74.25.Ha – Properties of superconductors: Magnetic properties including vortex structures and related phenomena
© EPLA, 2010