Common topological origin of longitudinal and transverse magnetoresistance in Fe3GeTe2

TL;DR

This paper uncovers a topological link between the planar Hall effect and positive longitudinal magnetoresistance in Fe3GeTe2, showing their correlation and angular dependence related to magnetic field orientation.

Contribution

It demonstrates the coexistence and correlation of topological features in magnetotransport phenomena in Fe3GeTe2, revealing their angular dependence and underlying mechanisms.

Findings

Correlation between topological cusp anomaly and positive longitudinal MR

Sharp angular dependence of MR and Hall response

Exponential decay of correlation with magnetic field orientation

Abstract

In this work, we reveal the coexistence and correlation of a topological cusp anomaly in the planar Hall signal and a spin-flip scattering dominated positive longitudinal magnetoresistance (MR) across the entire temperature range below the Curie point in Fe3GeTe2. This correlation dies out exponentially as the magnetic field is directed away from the ab-plane, resulting in unusually sharp polar angle dependence of longitudinal MR and the Hall response.