Abstract
Magnetic properties and magnetocaloric effects (MCEs) of the intermetallic Ho3Al2 compound are investigated by magnetization and heat capacity measurements. Two successive magnetic transitions, a spin-reorientation (SR) transition at TSR=31K followed by a ferromagnetic (FM) to paramagnetic (PM) transition at TC=40K, are observed. Both magnetic transitions contribute to the MCE and result in a large magnetic entropy change (ΔSM) in a wide temperature range. The maximum values of −ΔSM and adiabatic temperature change (ΔTad) reach 18.7J/kgK and 4.8K for the field changes of 0–5T, respectively. In particular, a giant value of refrigerant capacity (RC) is estimated to be 704J/kg for a field change of 5T, which is much higher than those of many potential refrigerant materials with similar transition temperatures.
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