Abstract
We report on the reversible, non-volatile and polarity-dependent resistiveswitching between superconductor and insulator states at the interfaces of anAu/YBa2Cu3O7−δ (YBCO)/Au system. We show that, upon application of electric pulses, the superconductingstate of YBCO in regions near the electrodes can be reversibly removed and restored. Inaddition, four-wire measurements reveal that pulsing also induces significant non-volatilechanges in the bulk resistance. We argue that our observations are compatiblewith a scenario where the switching effect is due to migration of oxygen ionsalong grain boundaries that control the inter-grain superconducting coupling.
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