Structural characterization, magnetic, magnetocaloric properties and phenomenological model in manganite La0.75 Sr0.1Ca0.15 MnO3 compound

The La0.75Sr0.1Ca0.15MnO3 sample have been prepared by sol-gel method. The crystallographic study shows that the sample crystallize in the rhombohedral structure with R3¯c space group. The field dependence of magnetocaloric properties of manganite La0.75Sr0.1Ca0.15MnO3 with second order phase transition material is investigated using a phenomenological model. The model parameters were determined from the magnetization data adjustment and were used to give better fits to magnetic transition and to calculate the magnetocaloric thermodynamic quantities. The magnetic entropy change reaches a peak of about 5.8 J/kg K and the relative cooling power (RCP) value of 195 J/kg at 305 K upon 5 T applied magnetic field. The critical exponents associated with ferromagnetic transition have been determined from magnetocaloric effect methods.