Origin of in-plane anisotropic resistivity in the antiferromagnetic phase of Fe$_{1+x}$Te

TL;DR

This paper explains the in-plane resistivity anisotropy in FeTe's antiferromagnetic phase by calculating resistivity with a memory function approach, linking it to Fermi surface topology and experimental observations.

Contribution

It provides a theoretical explanation for the anisotropic resistivity in FeTe's antiferromagnetic phase based on Fermi surface topology and memory function calculations.

Findings

Resistivity is larger along the antiferromagnetic direction.

Anisotropy is mainly due to differences in Drude weight.

Results align with recent experimental reports.

Abstract

Motivated by a recent experimental report on in-plane anisotropic resistivity in the double-striped antiferromagnetic phase of FeTe, we theoretically calculate in-plane resistivity by applying a memory function approach to the ordered phase. We find that the resistivity is larger along an antiferromagnetically ordered direction than along a ferromagnetically ordered one, consistent with experimental observation. The anisotropic results are mainly contributed from Drude weight, whose behavior is attributed to Fermi surface topology of the ordered phase.