# Topological semimetal state and field-induced Fermi surface reconstruction in antiferromagnetic monopnictide NdSb

## TL;DR

This paper reports the experimental discovery of a Dirac semimetal state in antiferromagnetic NdSb, supported by band calculations and negative magnetoresistance, with a field-induced Fermi surface reconstruction linked to spin polarization changes.

## Contribution

First experimental realization of a topological semimetal state in a magnetic material, NdSb, combining topological and magnetic properties for studying magneto-topological phenomena.

## Key findings

- Observation of Dirac semimetal state in NdSb
- Detection of chiral anomaly induced negative magnetoresistance
- Field-induced Fermi surface reconstruction

## Abstract

We report the experimental realization of Dirac semimetal state in NdSb, a material with antiferromagnetic ground state. The occurrence of topological semimetal state has been well supported by our band structure calculations and the experimental observation of chiral anomaly induced negative magnetoresistance. A field-induced Fermi surface reconstruction is observed, in response to the change of spin polarization. The observation of topological semimetal state in a magnetic material provides an opportunity to investigate the magneto-topological phenomena.

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Source: https://tomesphere.com/paper/1702.08121