Observation of large positive magnetoresistance and its sign reversal in GdRhGe

TL;DR

This study investigates GdRhGe's magnetic properties, heat capacity, and magnetoresistance, revealing two antiferromagnetic transitions, a sign reversal in MR, and complex magnetic behavior with potential applications in magnetic sensors.

Contribution

It reports the observation of large positive magnetoresistance and its sign reversal in GdRhGe, highlighting complex magnetic transitions and their effects on transport properties.

Findings

Two antiferromagnetic transitions at 31.8 K and 24 K.

Sign reversal of magnetoresistance below T1.

Large positive MR of 48% at 2 K under 50 kOe.

Abstract

Magnetic properties, heat capacity and magnetoresistance (MR) of polycrystalline GdRhGe are investigated. It shows two antiferromagnetic transitions, one at T1=31.8 K and the other at T2=24 K, and field induced metamagnetic transition over a wide temperature range. The ac susceptibility data reveal that the transition at 24 K is not simple antiferromagnetic. Dominant contributions to the heat capacity and the resistivity have been identified. MR is found to show sign reversal just below T1 and attains a large positive value of 48% at 2 K for 50 kOe. Like MR, the isothermal magnetic entropy change also undergoes a sign reversal as the temperature is varied, indicating a change of the magnetic structure and the moment amplitude in determining these properties.