Matthew Yankowitz, University of Washington
PAA A102
When a superconductor is cooled below its critical temperature, its resistance ordinarily falls to zero and stays there. I will present experiments on ultra-clean rhombohedral graphene that break this expectation in two ways. In one regime, superconductivity appears to "fail": the usual hallmarks of its onset are present, but the resistance saturates at a finite value, the signature of the long-debated anomalous metal. Nearby in gate space, the resistance instead "flickers" randomly in time between zero and its full normal-state value. I will discuss what these behaviors reveal about superconductivity in a system with competing magnetic phases.