Abstract
The magnetic properties and the magnetocaloric effect (MCE) in the Er4PdMg compound have been investigated by magnetization and heat capacity measurements. The compound undergoes a second-order magnetic phase transition from a paramagnetic to a ferromagnetic state at Curie temperatures of TC ${T_C}\sim 21.5$ K, which is just above the liquid hydrogen temperature (20.3 K). A large reversible MCE was observed. The maximum values of magnetic entropy change ( $-\Delta S_{M}^{\textrm {max}}$ ) and adiabatic temperature change $\Delta T_{\rm ad}^{\textrm {max}}$ ) for Er4 PdMg under a field change of 0−7 T are 20.6 J/kg K and 5.5 K, respectively. The corresponding value of relative cooling power (RCP) was evaluated to be 742 J/kg. The large reversible MCE together with considerable RCP values makes the Er4PdMg compound attractive for magnetic refrigeration.
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