Abstract
We have measured transport properties and magnetic responses of direct current superconducting quantum interference devices(dc-SQUIDs) with Nb/Ru/Sr2RuO4 junctions on the same Ru inclusion of a Sr2RuO4-Ru eutectic crystal. We observed a superconducting transition of the Ru at 0.50 K and another transition with anomalous interference patterns of the SQUID at 0.40 K. The second transition led to change of the SQUID structure due to energy competition of alternative supercurrent paths. Phase shifts of the peak of the Fraunhofer diffraction pattern were observed below the transition temperatures, implying topological effects due to a chiral p-wave state or its competition with a s-wave state.
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