Multiorbital Effects on Antiferromagnetism in Fe Pnictides

TL;DR

This study uses a Hartree-Fock approach on a two-orbital model to explore antiferromagnetism in Fe pnictides, revealing how doping affects magnetic order and Fermi surface structure.

Contribution

It demonstrates the emergence of AFM order with ferro-orbital order in a two-orbital model and analyzes doping effects on magnetic and electronic properties.

Findings

AFM order with Q=(pi,0) is stabilized.

Doping causes a continuous change in AFM moment, then abrupt destruction.

Fermi surfaces persist and evolve significantly with doping.

Abstract

We apply a Hartree-Fock approximation to a two-orbital model proposed for Fe pnictide superconductors. It is found that the antiferromagnetic (AFM) order with the ordering vector Q=(pi,0) is realized. The AFM order appears simultaneously with ferro-orbital order, the latter leads to a secondary lattice distortion. We also investigate the influence of doping on the AFM order. The size of the AFM moment changes continuously for lightly doped cases, but when the amount of doped carriers exceeds a certain value the AFM state is suddenly destroyed. We also show that Fermi surfaces remain and change significantly on doping even in the AFM state. This behaviour is explained by considering the nesting due to the multi-sheet Fermi-surface structure and multiorbital nature of the electronic bands characteristic to Fe pnictides.