Evidence of Pseudogravitational Distortions of the Fermi Surface Geometry in the Antiferromagnetic Metal FeRh

TL;DR

This paper reveals how pseudogravitational fields influence Fermi surface distortions in FeRh, linking high-energy physics concepts with condensed matter phenomena to better understand magnetic materials with strong spin-orbit interactions.

Contribution

It introduces the concept of pseudogravitational fields to explain Fermi surface distortions in FeRh, bridging high-energy physics and condensed matter insights.

Findings

Sign change in magnetoresistance linked to Fermi surface morphology

Fermi surface distortions explained via pseudogravitational fields

Provides a new perspective on magnetic materials with strong spin-orbit coupling

Abstract

The confluence between high-energy physics and condensed matter has produced groundbreaking results via unexpected connections between the two traditionally disparate areas. In this work, we elucidate additional connectivity between high-energy and condensed matter physics by examining the interplay between spin-orbit interactions and local symmetry-breaking magnetic order in the magnetotransport of thin-film magnetic semimetal FeRh. We show that the change in sign of the normalized longitudinal magnetoresistance observed as a function of increasing in-plane magnetic field results from changes in the Fermi surface morphology. We demonstrate that the geometric distortions in the Fermi surface morphology are more clearly understood via the presence of pseudogravitational fields in the low-energy theory. The pseudogravitational connection provides additional insights into the origins of a ubiquitous phenomenon observed in many common magnetic materials and points to an alternative methodology for understanding phenomena in locally-ordered materials with strong spin-orbit interactions.