The mechanism of anisotropic exchange interaction in superconducting iron arsenides

TL;DR

This paper investigates the underlying mechanism of anisotropic exchange interactions in iron-based superconductors using theoretical methods, revealing that the anisotropy is not dependent on orbital population differences.

Contribution

It introduces a combined theoretical approach to clarify the origin of anisotropic exchange interactions in iron arsenides, challenging previous assumptions about orbital population effects.

Findings

Reproduces the observed anisotropic exchange interaction.

Shows anisotropy is insensitive to d_{xz}/d_{yz} orbital population differences.

Provides a clear mechanism for magnetic interactions in iron arsenides.

Abstract

Using a combination of linear response theory and constrained orbital hybridization approach, we study the mechanism of magnetic exchange interaction of iron-based superconductor. We reproduce the observed highly anisotropic exchange interaction, and our constrain-orbital calculation unambiguously identifies that the anisotropic feature of exchange interaction is not sensitive to the unequal d$_{xz}$/d$_{yz}$ orbital population.