The Fulde-Ferrell-Larkin-Ovchinnikov state in pnictides

Abstract

Fe-based superconductors (FeSC) exhibit all the properties of systems that allow the formation of a superconducting phase with oscillating order parameter, called the Fulde--Ferrell--Larkin--Ovchinnikov (FFLO) phase. By the analysis of the Cooper pair susceptibility in two-band FeSC, such systems are shown to support the existence of a FFLO phase, regardless of the exhibited order parameter symmetry. We also show the state with nonzero Cooper pair momentum, in superconducting FeSC with $\sim \cos (k_x)\cdot \cos (k_y)$ symmetry, to be the ground state of the system in a certain parameter range.

8 pages, 4 figures Journal of Low Temperature Physics, (2013)