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 $\mathrm{Ho_2Pd_2Pb}$. Arc-melted $\mathrm{Ho_2Pd_2Pb}$ crystallizes in $\mathrm{Mo_2B_2Fe}$ type of tetragonal crystal structure and shows an antiferromagnetic behavior with N\'{e}el temperature of 4.5 K. The Arrott plots indicate that $\mathrm{Ho_2Pd_2Pb}$ 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 $\mathrm{Ho_2Pd_2Pb}$ belongs to a family of large MCE magnetic materials.