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Role of Spatial Amplitude Fluctuations in Highly Disordered s-Wave Superconductors | | Amit Ghosal
; Mohit Randeria
; Nandini Trivedi
; | | Date: |
4 Jun 1998 | | Subject: | Superconductivity; Disordered Systems and Neural Networks | cond-mat.supr-con cond-mat.dis-nn | | Affiliation: | Tata Institute of Fundamental Research | | Abstract: | The effect of non-magnetic impurities on 2D s-wave superconductors is studied beyond the weak disorder regime. Within the Bogoliubov-de Gennes (BdG) framework, the local pairing amplitude develops a broad distribution with significant weight near zero with increasing disorder. Surprisingly, the density of states continues to show a finite spectral gap. The persistence of the spectral gap at large disorder is shown to arise from the break up of the system into superconducting "islands". Superfluid density and off-diagonal correlations show a substantial reduction at high disorder.A simple analysis of phase fluctuations in the highly inhomogeneous BdG state is shown to lead to a transition to a non-superconducting state. | | Source: | arXiv, cond-mat/9806060 | | Services: | Forum | Review | PDF | Favorites | |
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