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Statistics of the subgap states of s superconductors A. Glatz and A. E. Koshelev

Summary: Statistics of the subgap states of są superconductors
A. Glatz and A. E. Koshelev
Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
Received 8 June 2010; published 21 July 2010
There is strong support in favor of an unusual s superconducting state in the recently discovered iron-based
superconductors in which the gap parameter has opposite signs in different bands. In this case, scattering
between different bands by impurities has a pair-breaking effect and introduces states inside the gap. We
studied the statistics of disorder-induced subgap states in s superconductors due to collective effects of
impurities. Numerically solving the two-band Bogolyubov equations, we explored the behavior of the density
of states and localization length. We located the mobility edge separating the localized and delocalized states
for the three-dimensional case and the crossover between the weak and strong localization regimes for the
two-dimensional case. We found that the widely used self-consistent T-matrix approximation is not very
accurate in describing subgap states.
DOI: 10.1103/PhysRevB.82.012507 PACS number s : 74.20. z, 74.62.En, 74.70.Xa
The recent discovery of high-temperature superconductiv-
ity in the iron arsenide LaFeAsO1-xFx Ref. 1 followed by
the discovery of several classes of superconducting
led to a major breakthrough in the field of super-
conductivity. The Fermi surface of these materials is com-


Source: Alexei, Koshelev - Materials Science Division, Argonne National Laboratory


Collections: Materials Science; Physics