Modeling the magnetic isotherms of (La0.56Ce0.14)Sr0.30MnO3 by a mean-field scaling method and estimation of magnetic entropy change

• The study of magnetic properties by a mean-field method was conducted.
• The mean-field scaling has been used to estimate magnetic entropy change.
• We determined the magnetic entropy of second magnetic phase transitions.

We report a study on the magnetic properties of the (La0.56Ce0.14)Sr0.30MnO3 perovskite, by a mean-field method. By scaling of the experimental magnetization data, the mean-field exchange parameter λ and the BS function of the equation of state BS[(H+Hexch)/T]BS[(H+Hexch)/T] are directly determined, as well as the order of the phase transition. The spin quantum number of the manganite has been also determined. The mean-field scaling has been used to estimate magnetic entropy change (−ΔSM)(−ΔSM) within the thermodynamics of the model and without using the usual numerical integration of a Maxwell relation. The maxima of the positive absolute value of (−ΔSM)(−ΔSM) upon variation of the applied magnetic field at 1 and 5 T are about 1.68 and 5.04 J kg−1 K−1, respectively. Satisfactory agreement between the mean-field model and experimental behavior has been found.