Magnetic Entropy Change by Mean-Field Theory for the Second-Order Phase Transition Manganite Nd0.6Sr0.3Ca0.1Mn0.975Fe
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- 作者：M. R. Laouyenne ; Sa. Mahjoub ; M. Baazaoui…
- 关键词：Magnetization ; Mean ; field theory ; Magnetic entropy change
- 刊名：Journal of Superconductivity Incorporating Novel Magnetism
- 出版年：2016
- 出版时间：May 2016
- 年：2016
- 卷：29
- 期：5
- 页码：1151-1157
- 全文大小：1,104 KB
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Sa. Mahjoub (1)
M. Baazaoui (1)
E. K. Hlil (2)
M. Oumezzine (1)
1. Laboratoire de physico-Chimie des Matériaux, Département de Physique, Faculté des Sciences de Monastir, Université de Monastir, 5019, Monastir, Tunisia
2. Institut Néel, CNRS - Université Joseph Fourier, BP 166, F-38042, Grenoble Cedex9, France - 刊物类别：Physics and Astronomy
- 刊物主题：Physics
Superconductivity, Superfluidity and Quantum Fluids
Magnetism and Magnetic Materials
Condensed Matter
Characterization and Evaluation Materials - 出版者：Springer New York
- ISSN：1557-1947
文摘
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.