# Magnetotransport properties and giant anomalous Hall angle in half-Heusler compound TbPtBi

## TL;DR

This study investigates the magnetotransport properties of TbPtBi, revealing large anisotropic magnetoresistance, evidence of Weyl fermions, and the largest reported anomalous Hall angle, highlighting its potential as a topological Weyl semimetal.

## Contribution

It provides a detailed analysis of TbPtBi's magnetotransport properties, demonstrating its giant anomalous Hall angle and Weyl fermion signatures, advancing understanding of half-Heusler topological materials.

## Key findings

- Large, non-saturating magnetoresistance with anisotropic behavior.
- Chiral anomaly-induced negative longitudinal magnetoresistance.
- Record-high anomalous Hall angle in TbPtBi.

## Abstract

Magnetic lanthanide half-Heuslers ($R$PtBi; $R$ being the lanthanide) represent an attractive subgroup of the Heusler family and have been identified as ideal candidates for time reversal symmetry breaking topological Weyl semimetals. In this paper, we present the detailed analysis of the magnetotransport properties of frustrated antiferromagnet TbPtBi. This material shows large, non-saturating magnetoresistance (MR) with unusual magnetic field dependence. The MR of TbPtBi is significantly anisotropic with respect to the magnetic field, applied along different crystallographic directions and indicates the anisotropic nature of the Fermi surface. The chiral anomaly induced negative longitudinal magnetoresistance confirms the presence of Weyl fermions. At low temperature, Berry phase driven large anomalous Hall conductivity has been observed. The calculated anomalous Hall angle is the largest reported so far.