PHASE-LOCKING IN A MULTIJUNCTION SUPERCONDUCTING LOOP

Mutual phase locking of Josephson junctions in a multijunction superco nducting loop (MSL) was investigated both theoretically and experiment ally. The theoretical analysis predicts the existence of phase-locked states, where the circulating current in the loop serves for phase loc king between junctions. The basic operating principles of a MSL were s tudied experimentally using high-T-c bicrystal Josephson junctions. Th e enhancement of phase locking stability with respect to series arrays is reported. (C) 1995 American Institute of Physics.