Magnetic Entropy Change by Mean-Field Theory for the Second-Order Phase Transition Manganite Nd0.6Sr0.3Ca0.1Mn0.975Fe0.025O3

In this work, we are going to show the method based on mean-field scaling for the Nd_0.6Sr_0.3Ca_0.1Mn_0.975Fe_0.025 O₃ sample, where from scaling of experimental magnetization data, the mean-field exchange parameter λ and the f function of the equation of state (M(T,H)=B_{S} [frac {left ({H+H_{text {ex}}} right )}{T}]) are directly determined. The scaling approach allows finding the dependence of H _ex on T or higher powers of M, which determine the order of the phase transition. Quantum spin number has been determined. In this study, we use (left | {Delta S_{M} (T)} right |) obtained from isothermal magnetization measurements; we compare this result to mean-field theory fittings from a novel scaling method through the use of theoretical results S, g, and λ. The obtained results by mean-field theory are suitable and in good agreement with the classical Maxwell relation.