Hysteretic magnetoresistance and unconventional anomalous Hall effect in the frustrated magnet TmB_4

TL;DR

This study investigates the magnetic and transport properties of TmB_4, revealing hysteretic magnetoresistance, unconventional anomalous Hall effect, and three-dimensional electronic behavior in a frustrated magnet system.

Contribution

It provides new insights into the magnetic domain wall structures and their influence on magnetoresistance and Hall effects in TmB_4, a frustrated magnet.

Findings

Hysteretic magnetoresistance observed at low temperatures.

Unconventional anomalous Hall effect detected, linear above saturation.

Resistivity shows no anisotropy, indicating 3D electronic structure.

Abstract

We study TmB_4, a frustrated magnet on the Archimedean Shastry-Sutherland lattice, through magnetization and transport experiments. The lack of anisotropy in resistivity shows that TmB_4 is an electronically three-dimensional system. The magnetoresistance (MR) is hysteretic at low-temperature even though a corresponding hysteresis in magnetization is absent. The Hall resistivity shows unconventional anomalous Hall effect (AHE) and is linear above saturation despite a large MR. We propose that complex structures at magnetic domain walls may be responsible for the hysteretic MR and may also lead to the AHE.