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

TL;DR

This study reports a significant magnetocaloric effect in Ho2Pd2Pb, a compound with antiferromagnetic order at low temperature, showing potential for magnetic refrigeration applications.

Contribution

The paper presents the discovery of a large magnetocaloric effect in Ho2Pd2Pb, characterized by detailed magnetic and structural analysis, highlighting its potential as a magnetic refrigerant.

Findings

Magnetocaloric effect (MCE) with ΔSm of 17.8 J/kg·K at 8 T.

Antiferromagnetic transition at 4.5 K confirmed by Arrott plots.

Refrigeration capacity of approximately 680 J/kg.

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.