Maxim M. Korshunov

TL;DR: In this paper, a spin fluctuation theory and the sign-changing s-wave symmetry of superconducting gap structures was proposed to account for the nonuniversality of the gap structures of FeNictide and chalcogenide superconductors.

TL;DR: In this paper, it was shown that the properties of Fe-pnictide and chalcogenide superconductors can be explained by considering spin fluctuation theory and accounting for the peculiar electronic structure of these systems coupled with the likely sign-changing s-wave symmetry.

TL;DR: In this paper, the spin response in the normal and superconducting states of the Fe-pnictide superconductors was analyzed based on the effective four-band model.

TL;DR: These experiments prove a commensurate static magnetic order with a strongly reduced ordered moment of 0.25(5)muB at the iron site below T(N)=138 K, well separated from a structural phase transition at T(S)=156 K.

TL;DR: In this article, the authors show that the lack of a coherence peak is fully consistent with the previously proposed nodeless extended s±-wave symmetry of the order parameter (whether in the clean or dirty limit) and that the low-temperature power-law behavior can be also explained in the framework of the same model but requires going beyond the Born limit.