Diffraction patterns and vortex structure of asymmetrical and cross Josephson junctions

The critical current of an asymmetrical Josephson junction as a function of magnetic field has been computed for junction lengths of 2λJ and 6λJ. The boundary conditions for the asymmetrical and cross junction (with an assumed current distribution) are derived. Similarity between the computed asymmetrical junction diffraction patterns and experimental patterns for the cross junction plus identical boundary conditions indicate that the current flow in the cross junction is the same as in the asymmetrical junction. Profiles of the current density in the linear and asymmetrical Josephson junctions are compared.