Large magnetocaloric effect in $\mbox{Ho}_2\mbox{Pd}_{2}\mbox{Pb}$

Abstract

We report the magnetocaloric effect (MCE) in a polycrystalline plumbide sample of $\mathrm{H}{\mathrm{o}}_2\mathrm{P}{\mathrm{d}}_2\mathrm{Pb}$. Arc-melted $\mathrm{H}{\mathrm{o}}_2\mathrm{P}{\mathrm{d}}_2\mathrm{Pb}$ crystallizes in $\mathrm{M}{\mathrm{o}}_2{\mathrm{B}}_2\mathrm{Fe}$ type of tetragonal crystal structure and shows an antiferromagnetic behavior with Néel temperature of 4.5 K. The Arrott plots indicate that $\mathrm{H}{\mathrm{o}}_2\mathrm{P}{\mathrm{d}}_2\mathrm{Pb}$ undergoes a second-order antiferromagnetic phase transition. The calculated isothermal magnetic entropy change ($\Delta S_m$), and relative power cooling (refrigeration capacity) for a change of field 0-8 T are 17.8 J.kg${}^{-1}$.K${}^{-1}$, and 680(497)~J.kg${}^{-1}$ respectively. The obtained results revealed that $\mathrm{H}{\mathrm{o}}_2\mathrm{P}{\mathrm{d}}_2\mathrm{Pb}$ belongs to a family of large MCE magnetic materials.