Magnetic properties and magnetocaloric effect of $\mathrm{T}{\mathrm{b}}_2\mathrm{R}{\mathrm{h}}_3\mathrm{Ge}$

Abstract

We report the structural, magnetic properties, and magnetocaloric effect of a new polycrystalline compound of $\mathrm{T}{\mathrm{b}}_2\mathrm{R}{\mathrm{h}}_3\mathrm{Ge}$. This present compound crystallizes with $\mathrm{M}{\mathrm{g}}_2\mathrm{N}{\mathrm{i}}_3\mathrm{Si}$-type of rhombohedral Laves phases (space group $R\overline{3}m$, hR18). The magnetic properties and magnetocaloric effect of the $\mathrm{T}{\mathrm{b}}_2\mathrm{R}{\mathrm{h}}_3\mathrm{Ge}$ 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 $\mathrm{T}{\mathrm{b}}_2\mathrm{R}{\mathrm{h}}_3\mathrm{Ge}$ 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

5 pages, and 8 figures

References in corpus (2)

• Correlation between magnetism and magnetocaloric effect in RCo2-based Laves phase compounds
• Magnetocaloric effect and critical behavior near the paramagnetic to ferrimagnetic phase transition temperature in TbCo2-xFex