Interplay between static and dynamic properties of semifluxons in YBa2Cu3O7-δ 0-π Josephson junctions

We have investigated the static and dynamic properties of long YBa2Cu3O7−δ 0−π Josephson junctions and compared them with those of conventional 0 junctions. Scanning SQUID microscope imaging has revealed the presence of a semifluxon at the phase discontinuity point in 0−π Josephson junctions. Zero field steps have been detected in the current-voltage characteristics of all junctions. Comparison with simulation allows us to attribute these steps to fluxons traveling in the junction for conventional 0 junctions and to fluxon-semifluxon interactions in the case of 0−π Josephson junctions