Normal state magnetotransport properties of $\beta$-FeSe superconductors

TL;DR

This study investigates the normal state magnetotransport properties of $eta$-FeSe superconductors, combining experimental measurements with a theoretical model to understand the effects of structural transitions and electron correlations.

Contribution

The paper introduces a simplified microscopic model with two correlated orbitals to describe magnetotransport in $eta$-FeSe, incorporating electron correlations and structural effects.

Findings

Structural transition affects electrical resistivity and magnetoresistance.

Moderate electron correlations improve the theoretical description of Hall coefficient.

Deformation-induced band splittings are comparable to ARPES reports.

Abstract

We present $\beta$-FeSe magnetotransport data, and describe them theoretically. Using a simplified microscopic model with two correlated effective orbitals, we determined the normal state electrical conductivity and Hall coefficient, using Kubo formalism. With model parameters relevant for Fe-chalcogenides, we describe the observed effect of the structural transition on the ab-plane electrical resistivity, as well as on the magnetoresistance. Temperature-dependent Hall coefficient data were measured at 16 Tesla, and their theoretical description improves upon inclusion of moderate electron correlations. We confirm the effect of the structural transition on the electronic structure, finding deformation-induced band splittings comparable to those reported in angle-resolved photoemission.