Physics – Condensed Matter – Superconductivity
Scientific paper
2001-11-10
J. Phys. A: Math. Gen. 35 (2002) 4201-4217
Physics
Condensed Matter
Superconductivity
18 pages AMSLaTeX (with LaTeX2e), 6 eps figures
Scientific paper
10.1088/0305-4470/35/19/302
When subject to a weak magnetic impurity distribution, the order parameter and quasi-particle energy gap of a weakly disordered bulk s-wave superconductor are suppressed. In the Born scattering limit, recent investigations have shown that `optimal fluctuations' of the random impurity potential can lead to the nucleation of `domains' of localised states within the gap region predicted by the conventional Abrikosov-Gor'kov mean-field theory, rendering the superconducting system gapless at any finite impurity concentration. By implementing a field theoretic scheme tailored to the weakly disordered system, the aim of the present paper is to extend this analysis to the consideration of magnetic impurities in the unitarity scattering limit. This investigation reveals that the qualitative behaviour is maintained while the density of states exhibits a rich structure.
Marchetti Francesca Maria
Simons Benjamin D.
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