Gap Fluctuations in Inhomogeneous Superconductors

Details Gap Fluctuations in Inhomogeneous Superconductors Gap Fluctuations in Inhomogeneous Superconductors

2001-06-06

arxiv.org/abs/cond-mat/0106109v1

Phys. Rev. B 64, 134516 (2001)

Physics

Condensed Matter

Superconductivity

11 pages, 3 figures included. To be published in PRB (Sept. 2001)

Scientific paper

10.1103/PhysRevB.64.134516

Spatial fluctuations of the effective pairing interaction between electrons in a superconductor induce variations of the order parameter which in turn lead to significant changes in the density of states. In addition to an overall reduction of the quasi-particle energy gap, theory suggests that mesoscopic fluctuations of the impurity potential induce localised tail states below the mean-field gap edge. Using a field theoretic approach, we elucidate the nature of the states in the `sub-gap' region. Specifically, we show that these states are associated with replica symmetry broken instanton solutions of the mean-field equations.

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