Superfluid density of a pseudogapped superconductor near SIT
Abstract
We analyze critical behavior of superfluid density s in strongly disordered superconductors near superconductor-insulator transition and compare it with the behavior of the spectral gap for collective excitations. We show that in contrast to conventional superconductors, the superconductors with preformed pairs display unusual scaling relation s 2 close to superconductor-insulator transition. This relation have been reported in very recent experiments.
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