Negative local superfluid densities: The difference between dirty superconductors and dirty Bose liquids
B. I. Spivak, S. A. Kivelson
DOI 10.1103/PhysRevB.43.3740 · Physical Review B
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Abstract
We show that in a distorted superconductor near the superconductor-to-insulator transition, the local superfluid density Ns fluctuates from point to point in sign as well as magnitude. We demonstrate this explicitly with a simple model in which correlation effects produce a negative Josephson coupling between two superconducting grains. We argue more generally that both correlation effects and resistance fluctuations will produce random signs of Ns. This implies that a disordered superconductor is more like a quantum XY spin glass than a disordered Bose liquid.
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