Large magnetic entropy change above 300 K in (La0.56Ce0.14)Sr0.3MnO3 perovskite

Magnetic field dependence of the magnetic entropy change (Delta S-M) is the key for magnetic refrigeration. A large magnetic entropy change (Delta S-M) associated with the ferromagnetic-paramagnetic transition in Ce-doped La0.7Sr0.3MnO3 material has been observed. It is shown for (La0.56Ce0.14)Sr-0.3 MnO3 composition at the Curie temperature of 357K, that the maxima of the magnetic entropy changes vertical bar Delta S-M(max)vertical bar upon variation of the applied magnetic field at I and 5T are about 1.55 and 4.78 J kg(-1) K-1, respectively. Due to the large (Delta S-M) and high Curie temperature, the (La0.56Ce0.14)Sr0.3MnO3 perovskite is suggested to be used as potential magnetic refrigerants for magnetic refrigeration technology above room temperature. (C) 2009 Elsevier B.V. All rights reserved.