Josephson interferometer in a ring topology as a proof of the symmetry of Sr2RuO4 -: art. no. 214501

The Josephson effect is theoretically studied in two types of SQUIDs consisting of s wave superconductor and Sr2RuO4. Results show various response of the critical Josephson current to applied magnetic fields depending on the type of SQUID and on the pairing symmetries. In the case of a p(x)+ip(y) wave symmetry, the critical current in a corner SQUID becomes an asymmetric function of magnetic fields near the critical temperatures. Our results well explain a recent experimental finding [Nelson , Science 306, 1151 (2004)]. We also discuss effects of chiral domains on the critical current.