Mn 3 Sn 2 presents two second-order magnetic transitions of ferromagnetic origin at TC1∼262K and TC2∼227K. Both transitions give peaks of similar magnitude (ΔSMmax∼27mJcm−3K−1 for ΔH=5T) in the temperature dependence of the magnetic entropy change yielding an anomalous magnetocaloric response approaching that of a two-component hybrid material. Its refrigerant capacity of ∼1.1Jcm−3 (ΔH=5T) for an optimal reversible cycle with cold and hot ends at ∼220 and ∼280K is about half that of the best known magnetic refrigerants working around room temperature. However, Mn3Sn2 possess several advantages making it a promising candidate for magnetic refrigeration applications: (i) it has a large temperature span with a roughly constant ΔSM, (ii) it is not subjected to hysteresis losses, and (iii) it is made from low-cost and nontoxic elements.
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Mazet et al. (2006) studied this question.
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