Gap symmetry and structure of Fe-based superconductors

Details Gap symmetry and structure of Fe-based superconductors Gap symmetry and structure of Fe-based superconductors

2011-06-19

arxiv.org/abs/1106.3712v2

Rep. Prog. Phys. 74, 124508 (2011)

Physics

Condensed Matter

Superconductivity

86 pages, review

Scientific paper

10.1088/0034-4885/74/12/124508

The recently discovered Fe-pnictide and chalcogenide superconductors display low-temperature properties suggesting superconducting gap structures which appear to vary substantially from family to family, and even within families as a function of doping or pressure. We propose that this apparent nonuniversality can actually be understood by considering the predictions of spin fluctuation theory and accounting for the peculiar electronic structure of these systems, coupled with the likely 'sign-changing s-wave' (s\pm) symmetry. We review theoretical aspects, materials properties and experimental evidence relevant to this suggestion, and discuss which further measurements would be useful to settle these issues.

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