Supercurrent dephasing by electron-electron interactions
Abstract
We demonstrate that in sufficiently long diffusive superconducting-normal-superconducting (SNS) junctions dc Josephson current is exponentially suppressed by electron-electron interactions down to zero temperature. This suppression is caused by the effect of Cooper pair dephasing which occurs in the normal metal and defines a new fundamental length scale L in the problem. Provided the temperature length exceeds L this dephasing length can be conveniently extracted from equilibrium measurements of the Josephson current.
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