Magnetic properties and magnetocaloric effect of $\mathrm{Tb_2Rh_3Ge}$

TL;DR

This study investigates the magnetic and magnetocaloric properties of a newly synthesized polycrystalline compound, Tb2Rh3Ge, revealing its ferromagnetic behavior and potential for magnetic refrigeration applications.

Contribution

The paper reports the synthesis, structural characterization, and detailed magnetic and magnetocaloric analysis of Tb2Rh3Ge, a new compound with notable magnetocaloric effects and a second order phase transition.

Findings

Tb2Rh3Ge exhibits ferromagnetism with Tc = 56 K.

The compound shows significant magnetocaloric effect with ΔSm = 12.74 J/kg-K at 9 T.

It undergoes a second order ferromagnetic phase transition.

Abstract

We report the structural, magnetic properties, and magnetocaloric effect of a new polycrystalline compound of $\mathrm{Tb_2Rh_3Ge}$. This present compound crystallizes with $\mathrm{Mg_2Ni_3Si}$-type of rhombohedral Laves phases (space group $R\overline{3}m$, hR18). The magnetic properties and magnetocaloric effect of the $\mathrm{Tb_2Rh_3Ge}$ is explored through dc-magnetization measurements. Temperature dependence of magnetization revealed that the compound exhibits ferromagnetic behavior with $T_C$$=$56 K. The field dependence of magnetization indicates that $\mathrm{Tb_2Rh_3Ge}$ is a soft ferromagnet. The obtained isothermal magnetic entropy changes ($\Delta S_m$), and refrigeration capacity (relative power cooling) for a change of magnetic field 0-9 T are 12.74 J/kg-K, and 497(680) J/kg respectively. The Arrott plots and universal curve of normalized $\Delta S_m$ indicate that this compound undergoes second order ferromagnetic phase transition