Dear Colleagues,

The mechanism of high-temperature superconductivity in iron-based superconductors is still under debate. One of the reasons for their puzzling behavior is the absence of the precise knowledge about the symmetry and structure of the order parameter. Initial simplified two-dimensional models of the electronic structure of these materials triggered a number of theoretical proposals, but the consensus was not reached even taking into account this significant approximation. Further studies revealed much more complicated electronic structure of the most robust superconductors of this family. Low energy dynamics turned out to be strongly influenced by three-dimensionality, orbital-dependent renormalization, Hund rule coupling and spin-orbit interaction. As a result of improvement of the sample quality, recent experiments were able to resolve corresponding to these complications singular Fermi surfaces. Novel developments in the field thus call for more detailed and precise studies of the order parameter in iron pnictides and chalcogenides. This Special Issue is aimed at collecting such papers, contributing to the understanding of superconductivity in iron-based materials.

Dr. Sergey Borisenko
Guest Editor

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