Large Magnetic Entropy Change in La0.55Ce0.2Ca0.25MnO3 Perovskite

In this paper, magnetic property and magnetocaloric effect (MCE) in perovskite manganites of the type La(0.75-x)CexCa0.25MnO3 (x = 0.0, 0.2, 0.3 and 0.5) synthesized by using the standard solid state reaction method have been reported. From the magnetic measurements as a function of temperature and applied magnetic field, we have observed that the Curie temperature (T-C) of the prepared samples strongly dependent on Ce content and was found to be 255, 213 and 150 K for x = 0.0, 0.2 and 0.3, respectively. A large magnetocaloric effect in vicinity of T-C has been observed with a maximum magnetic entropy change (vertical bar Delta S-M vertical bar(max)) of 3.31 and 6.40 J/kgK at 1.5 and 4 T, respectively, for La0.55Ce0.2Ca0.25MnO3. In addition, relative cooling power (RCP) of the sample under the magnetic field variation of 1.5 T reaches 59 J/kg. These results suggest that La0.55Ce0.2Ca0.25MnO3 compound could be a suitable candidate as working substance in magnetic refrigeration at 213 K.