Magnetic Entropy Change by Mean-Field Theory for the Second-Order Phase Transition Manganite Nd0.6Sr0.3Ca0.1Mn0.975Fe0.025O3 |
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Authors: | M. R. Laouyenne Sa. Mahjoub M. Baazaoui E. K. Hlil M. Oumezzine |
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Affiliation: | 1.Laboratoire de physico-Chimie des Matériaux, Département de Physique, Faculté des Sciences de Monastir,Université de Monastir,Monastir,Tunisia;2.Institut Néel,CNRS - Université Joseph Fourier,Grenoble Cedex9,France |
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Abstract: | In this work, we are going to show the method based on mean-field scaling for the Nd0.6Sr0.3Ca0.1Mn0.975Fe0.025 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. |
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