Large Negative Magnetoresistance in Antiferromagnetic Gd2Se3

TL;DR

This study reveals that antiferromagnetic Gd2Se3 exhibits a large negative magnetoresistance of about 65% near its magnetic transition, driven by suppression of spin scattering, highlighting its potential for magnetic transport applications.

Contribution

The paper demonstrates the coupling between magnetism and electronic transport in Gd2Se3, showing significant negative magnetoresistance linked to magnetic transitions.

Findings

Gd2Se3 has an antiferromagnetic ground state below 11 K.

Large negative magnetoresistance (~65%) observed near the magnetic transition.

Positive MR observed near field-induced spin-flop transitions.

Abstract

Rare earth chalcogenides provide a great platform to study exotic quantum phenomena such as superconductivity and charge density waves. Among various interesting properties, the coupling between magnetism and electronic transport has attracted significant attention. Here, we report the investigation of such coupling in {alpha}-Gd2Se3 single crystals through magnetic, calorimetric, and transport property measurements. {alpha}-Gd2Se3 is found to display an antiferromagnetic ground state below 11 K with metamagnetic spin-flop transitions. The magnetic fluctuations remain strong above the transition temperature. Transport measurements reveal an overall metallic transport behavior with a large negative magnetoresistance of ~ 65% near the magnetic transition temperature, together with positive MR near the field-induced spin-flop transitions, which can be understood in terms of the suppression of spin scattering by the magnetic field.