Abstract
A large magnetic-entropy change Δ S M associated with the ferromagnetic–paramagnetic transition in CMR materials (La 0.65Sr 0.35MnO 3, La 0.6Sr 0.2Ca 0.2MnO 3, La 0.6Sr 0.2Ba 0.2MnO 3 and La 0.7Ca 0.06Ba 0.24MnO 3) has been observed. It is shown that the Δ S M reaches a maximum value of 2.26 J/kg/K for La 0.6Sr 0.2Ba 0.2MnO 3 composition at Curie temperature of 354 K, upon 10 kOe applied field variation. Due to the large Δ S M and high Curie temperature, these CMR materials are suggested to use as active magnetic refrigerants for magnetic refrigeration technology above room temperature.
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