Giant reversible magnetocaloric effect in ErMn2Si2 compound with a second order magnetic phase transition

Abstract

The magnetic properties and magnetocaloric effect (MCE) in the ternary intermetallic compound ErMn2Si2 have been studied by magnetization and heat capacity measurements. A giant reversible MCE has been observed, accompanied by a second order magnetic phase transition from paramagnetic to ferromagnetic at ∼4.5 K. Under a field change of 5 T, the maximum value of magnetic entropy change (−ΔSMmax) is 25.2 J kg−1 K−1 with no thermal and field hysteresis loss, and the corresponding maximum value of adiabatic temperature change (ΔTadmax) is 12.9 K. Particularly, the values of −ΔSMmax and ΔTadmax reached 20.0 J kg−1 K−1 and 5.4 K for a low field change of 2 T, respectively. The present results indicate that the ErMn2Si2 compound is an attractive candidate for low temperature magnetic refrigeration.

Review of the Magnetocaloric Effect in RMnO3 and RMn2O5 Multiferroic Crystals

“…This makes the magnetic transition broader, leading to a large RC in TbMn 2 O 5 single crystals. On the other hand, the RC of the TbMn 2 O 5 single crystal (314 J/kg for 5 T) along the easy-axis is much larger than that found in the HoMn 2 O 5 oxide (334 J/kg for 7 T) [19] and even in some well-known intermetallics such as ErRu 2 Si 2 (196.5 J/kg for 5 T) [92], DySb (144 J/kg for 5 T) [98], and ErMn 2 Si 2 (273 J/kg for 5 T) [99].…”

Magnetic properties and magnetocaloric effect in ternary REAgAl (RE= Er and Ho) intermetallic compounds

“…Large values of DS M and DT ad are considered to be the most important requirement for application. In recent years, the magnetism and MCE in lots of rare earth based intermetallic compounds have been systematically investigated, and some of them are found to possess not only large/giant MCE but also with negligible thermal and field hysteresis losses [7][8][9][10][11][12][13][14][15][16].…”

Magnetic property and magnetocaloric effect in TmCoAl compound

“…In addition, the permanent magnets in present market can only provide a maximum field of 2T, and this indicates that a large MCE under low magnetic field change is desirable for the fulfillment of a magnetic refrigerator simply using permanent magnets. Therefore, it is desirable to search new magnetocaloric materials exhibiting a large MCE under low field (DH 2T) with a second-order phase transition, such as ErMn 2 Si 2 [15], GdNi 4 M (M ¼ Al, Si) [16], PrMn 1.4 Fe 0.6 Ge 2 [17] and TbCo 3 B 2 [18]. The intermetallic ternary compounds of the RTX 1:1:1 type (R ¼ rare-earth, T ¼ transition metal, X ¼ p-metal) have been devoted much effort to study.…”