Kamihara and coworkers' report of superconductivity at T c= 26 K in fluorine-doped
LaFeAsO inspired a worldwide effort to understand the nature of the superconductivity in this …

High-transition temperature (high-T c) superconductivity in the iron pnictides or
chalcogenides emerges from the suppression of the static antiferromagnetic order in their …

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

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 …

Technological progress in material synthesis, as well as artificial realization of condensed
matter scenarios via ultra-cold atomic gases in optical lattices or epitaxial growth of thin …

If strong electron-electron interactions between neighboring Fe atoms mediate the Cooper
pairing in iron-pnictide superconductors, then specific and distinct anisotropic …

Superconductors are classified by their pairing mechanism and the coupling strength,
measured as the ratio of the energy gap, 2 Δ, to the critical temperature, T c. We present an …

We have performed powder inelastic neutron scattering measurements on the
unconventional superconductor β-FeSe (T c≃ 8 K). The spectra reveal highly dispersive …

The onset of superconductivity at the transition temperature is marked by the onset of order,
which is characterized by an energy gap. Most models of the iron-based superconductors …

The present article reviews recent experimental investigations of spin dynamics in iron-
based superconductors and their parent compounds by means of inelastic neutron …