$\delta$-biased Josephson tunnel junctions

Abstract

The behavior of a long Josephson tunnel junction drastically depends on the distribution of the dc bias current. We investigate the case in which the bias current is fed in the central point of a one-dimensional junction. Such junction configuration has been recently used to detect the persistent currents circulating in a superconducting loop. Analytical and numerical results indicate that the presence of fractional vortices leads to remarkable differences from the conventional case of uniformly distributed dc bias current. The theoretical findings are supported by detailed measurements on a number of $\delta$-biased samples having different electrical and geometrical parameters.

14 pages, 10 figures

References in corpus (5)

• Spontaneous Fluxoid Formation in Superconducting Loops
• Semi-fluxons in long Josephson 0-pi-junctions
• Fluxon-semifluxon interaction in an annular long Josephson 0-pi-junction
• Oscillatory eigenmodes and stability of one and two arbitrary fractional vortices in long Josephson 0-kappa-junctions
• Theory of fractional vortex escape in a 0-kappa long Josephson junction

Cited by in corpus (4)

• Long Josephson Tunnel Junctions with Doubly Connected Electrodes
• Elliptic Annular Josephson Tunnel Junctions in an external magnetic field: The statics
• Gaussianity revisited: Exploring the Kibble-Zurek mechanism with superconducting rings
• Planar Josephson Tunnel Junctions in an Asymmetric Magnetic Field