Abstract
The magnetocaloric effect (MCE) of La0.7-xHoxSr0.3MnO3 (x=0.2 and 0.3) perovskite oxides has been investigated. A phenomenological model is adopted for simulation of magnetization variation with temperature to investigate magnetocaloric properties such as magnetic entropy change, heat capacity change and relative cooling power. The results indicate the potential of this series of materials to achieve the MCE at temperatures near Curie temperature (TC). These compounds present as prospective candidates for cooling system in a wide temperature interval in the vicinity of room temperature. The results confirm that the phenomenological model is undoubtedly beneficial for the prediction of the magnetocaloric effect of magnetic materials. Moreover, the effect of holmium (Ho) doping in MCE of La0.7Sr0.3MnO3 has been discussed comparing the results obtained from our calculation for Ho-doped La0.7Sr0.3MnO3 and for non-doped La0.7Sr0.3MnO3 calculated earlier. Keywords: solid state magnetic refrigeration, phase transition, phenomenological model.
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