The magnetocaloric effect in polycrystalline of Pr 1 − x Sr x MnO 3 ( x = 0.3, 0.4, 0.5) was investigated. A large magnetic entropy change (7.1 J/kg K) is discovered in Pr 0.5 Sr 0.5 MnO 3 under a low magnetic field of 1 T at charge-ordered state transition temperature (161 K). The physical mechanism is related to a drastic magnetization change at a temperature where the field-induced magnetic, electron and structural phase transitions occur (from antiferromagnetic charge-ordered state to ferromagnetic charge-disordered state).
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Chen et al. (2000) studied this question.
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