Abstract
The magnetocaloric effect of GdCo2B2 was studied by magnetization and heat capacity measurements. A giant reversible magnetocaloric effect has been observed which is related to a field-induced first order metamagnetic transition from antiferromagnetic to ferromagnetic state. The values of maximum magnetic entropy change (−ΔSMmax) reach 9.3 and 21.5 J kg−1 K−1 for the field change of 2 and 7 T with no obvious hysteresis loss around 25 K, respectively. The corresponding maximum adiabatic temperature changes (ΔTadmax) are evaluated to be 6.7 and 18.9 K. These values are even larger than some of potential magnetic refrigerant materials reported in the same temperature range and also comparable to the room temperature giant magnetocaloric materials. These results indicated that GdCo2B2 could be a promising candidate for magnetic refrigeration at low temperatures.
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