On spatial non-homogeneity in iron pnictides: formation of stripes

TL;DR

This paper proposes that the coexistence of antiferromagnetism and superconductivity in iron-pnictides arises from domain walls in the SDW state, leading to a modulated structure similar to the FFLO phase.

Contribution

It introduces a scenario where spatial heterogeneity results from domain wall formation in the SDW state, explaining the coexistence of magnetic order and superconductivity.

Findings

Heterogeneity is caused by domain walls in SDW state.

Superconductivity emerges from modulated SDW structure.

Analogy to FFLO-phase in superconductors.

Abstract

The heterogeneous coexistence of antiferromagnetism (SDW) and superconductivity on a mesoscopic scale was observed in iron-pnictides in many recent experiments. We suggest and discuss the scenario in which the heterogeneity is caused by formation of domain walls inherent to the SDW state of pnictides at a proper doping or under applied pressure. Superconductivity would emerge from the modulated SDW structure. The phenomenon is akin to the FFLO-phase in superconductors.