Review paper: Magnetocaloric effects in RTX intermetallic compounds (R = Gd~Tm, T = Fe~Cu and Pd, X = Al and Si)

TL;DR

This review discusses the magnetocaloric effect in RTX intermetallic compounds, highlighting their diverse magnetic properties and potential for low-temperature magnetic refrigeration applications.

Contribution

It provides a comprehensive overview of the recent research on MCE in RTX compounds, emphasizing their structural and magnetic diversity and potential for practical use.

Findings

RTX compounds exhibit large MCE in ferromagnetic and antiferromagnetic states.

Certain compounds like ErFeSi and HoCuAl show large reversible MCE at low fields.

The magnetic properties are key to understanding and optimizing MCE in these materials.

Abstract

The ternary intermetallic RTX compounds (R = rare earth, T = transitional metal, X = p-block metal) have been investigated extensively in the past few decades due to their interesting physical properties. Recently, much attention has been paid to the magnetocaloric effect (MCE) of these RTX compounds, especially the ones with heavy rare-earth, for their potential application in low temperature magnetic refrigeration. In this paper, we review the MCE of RTSi and RTAl systems with R = Gd~Tm, T = Fe~Cu and Pd, which are widely investigated in recent years. It is found that these RTX compounds exhibit various crystal structures and magnetic properties, which then result in different MCE. Large MCE has been observed not only in the typical ferromagnetic materials but also in the antiferromagnetic materials. The magnetic properties have been studied in detail to discuss the physical mechanism of large MCE in RTX compounds. Particularly, some RTX compounds, such as ErFeSi, HoCuSi, HoCuAl, etc, exhibit large reversible MCE under low magnetic field change, which suggests that these compounds could be promising materials for magnetic refrigeration in low temperature range.