I review theoretical ideas and implications of experiments for the gap structure and symmetry
of the Fe-based superconductors. Unlike any other class of unconventional …

The recently discovered Fe-pnictide and chalcogenide superconductors display low-
temperature properties suggesting superconducting gap structures which appear to vary …

We have reexamined the problem of disorder in two-band superconductors, and shown,
within the framework of the T-matrix approximation, that the suppression of T c can be …