Unconventional superconductivity in iron-based superconductors in a three-band model

Abstract

Iron-based superconductors exhibit features of systems where the Fulde Ferrell Larkin Ovchinnikov phase, a superconducting state with non-zero total momentum of the Cooper pairs, is actively sought. Experimental and theoretical evidence points strongly to the Fulde Ferrell Larkin Ovchinnikov phase in these materials above the Pauli limit. In this article we discuss the ground state of iron-based superconductors near the critical magnetic eld and the full h T phase diagram for pnictides in case of intra-band pairing, in a three-band model with s symmetry.