Interplay of Magnetism and Transport in HoBi

TL;DR

This paper investigates the relationship between magnetism and electrical transport in HoBi, revealing an extreme magnetoresistance that emerges after specific magnetic transitions, offering insights into magnetic XMR semimetals.

Contribution

It provides the first detailed study of how metamagnetic transitions influence magnetoresistance in HoBi, a magnetic rare-earth monopnictide.

Findings

XMR appears at fields above 2.3 T after magnetic transitions

Resistivity shows non-monotonic field dependence linked to metamagnetic transitions

HoBi's magnetoresistance behavior is unique among magnetic rare-earth monopnictides

Abstract

We report the observation of an extreme magnetoresistance (XMR) in HoBi with a large magnetic moment from Ho f-electrons. Neutron scattering is used to determine the magnetic wave vectors across several metamagnetic (MM) transitions on the phase diagram of HoBi. Unlike other magnetic rare-earth monopnictides, the field dependence of resistivity in HoBi is non-monotonic and reveals clear signatures of every metamagnetic transition in the low-temperature and low-field regime, at T < 2 K and H < 2.3 T. The XMR appears at H > 2.3 T after all the metamagnetic transitions are complete and the system is spin-polarized by the external magnetic field. The existence of an onset field for XMR and the intimate connection between magnetism and transport in HoBi are unprecedented among the magnetic rare-earth monopnictides. Therefore, HoBi provides a unique opportunity to understand the electrical transport in magnetic XMR semimetals.