Change in the order of magnetic transition in HoRhGe as probed by magnetoresistance and magnetocaloric studies

TL;DR

This study investigates how magnetic transition order in HoRhGe changes with field, revealing a shift from first order to second order, affecting magnetoresistance and magnetocaloric properties.

Contribution

It provides new insights into the field-induced change in magnetic transition order in HoRhGe through magnetoresistance and magnetocaloric measurements.

Findings

Large negative magnetoresistance of 25% at TN

Positive magnetoresistance of 12% at 2 K in low fields

Magnetic entropy change of 11.1 J/kg K at 50 kOe

Abstract

Magnetoresistance and magnetocaloric properties of polycrystalline HoRhGe have been studied. This compound orders antiferromagnetically with a Neel temperature (TN) of 5.5 K and undergoes a first order metamagnetic transition at 2 K. It shows a large negative magnetoresistance of 25% at TN, for a field of 50 kOe. However, at 2 K and in lower fields, the magnetoresistance is found to be positive with a magnitude of about 12%, which is attributed to the first order metamagnetic transition. The compound also shows large magnetocaloric effect near its Neel temperature. Field dependence of magnetic entropy change also reflects the change in the nature of magnetic transition as the field is increased. The value of magnetic entropy change (-{\Delta}SM) is found to be 11.1 J/kg K for a field change of 50 kOe. Field dependence of magnetoresistance and magnetocaloric effect clearly shows the change in the order of the metamagnetic transition with increase in field.