Magnetocaloric effect simulation by Landau theory and mean-field approximation in Pr0.5Sr0.5MnO3

The magnetocaloric effect in Pr0.5Sr0.5MnO3 (PSMO) has been successfully modeled in this work. PSMO undergoes a first-order antiferromagnetic charge ordering (AFM/CO) to a ferromagnetic (FM) transition at TCO = TN 165K followed by a second-order ferromagnetic (FM) to paramagnetic (PM) transition at the Curie temperature, TC 255 K. The magnetocaloric effect in PSMO has been studied by the simulation of the magnetic entropy change (-.SM) for these two transitions by developing a numerical approach based on the Landau free energy within the mean-field approximation. Simulated results agree well with the experimental ones for these two transitions.