The optimal inhomogeneity for superconductivity

Details The optimal inhomogeneity for superconductivity The optimal inhomogeneity for superconductivity

2002-12-11

arxiv.org/abs/cond-mat/0212256v1

Phys. Rev. B 68, 180503(R) (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages revtex4, 1 .eps figure

Scientific paper

10.1103/PhysRevB.68.180503

We study the effect of nonuniform transverse couplings on a quasi-one dimensional superconductor. We show that inhomogeneous couplings quite generally increase the superconducting (pairing) gap relative to the uniform system, but that beyond an ``optimal'' degree of inhomogeneity, they lead to a suppression of the tendency to phase coherence. The optimal conditions for superconductivity are derived. We also show that a {\it delocalized}, spin-gapped phase is stable against weak disorder in a four-leg-ladder with moderate repulsive interactions.

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