Large anomalous Hall angle in a topological semimetal candidate TbPtBi

TL;DR

This study investigates the magnetotransport properties of TbPtBi, revealing a large anomalous Hall angle linked to topological bands and Zeeman splitting, indicating potential for topological semimetal applications.

Contribution

It reports the first observation of a large anomalous Hall angle in a magnetic-field-induced topological semimetal, TbPtBi, with detailed analysis of its origin.

Findings

Large anomalous Hall resistivity and conductivity measured.

Anomalous Hall angle up to 33% observed.

Nonmonotonic magnetic field dependence linked to band structure changes.

Abstract

The magnetotransport properties in antiferromagnetic half-Heusler single crystals of TbPtBi, a magnetic-field-induced topological semimetal with simple band structure, are investigated. We found that a nonmonotonic magnetic field dependence of the anomalous Hall resistivity in a high magnetic field (B>7T), which come from the change of band structure induced by the Zeeman-like splitting when applying the external magnetic field. The experiment results show that credible anomalous Hall resistivity and conductivity reach up to 0.6798m{\Omega}cm and 125{\Omega}-1cm-1, respectively. A large AHA up to 33% is obtained in TbPtBi, which is comparable to typical ferromagnetic Weyl semimetal. The analysis of results show it should be attributed to topological band around EF and low carrier density.