Large magnetic entropy change (7.5 J/kg·K) was discovered in Nd 0.5 Sr 0.5 MnO 3 under a low magnetic field of 10 kOe at charge-ordered state transition temperature (183 K). It exceeds the magnetic entropy change in Gd by a factor of 2.4 at phase transition temperature under same magnetic field. The physical mechanism is related to the field-induced first-order magnetic, electron and structural transition (from antiferromagnetic charge-ordered state to ferromagnetic charge-disordered state).
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Chen et al. (2001) studied this question.
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