Pr0.67Sr0.33MnO3 纳米粒子中的磁相互作用：均场理论与实验

IF 1.9 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Bulletin of Materials Science Pub Date : 2024-08-17 DOI:10.1007/s12034-024-03301-5

W Mabrouki, A Krichene, N Chniba Boudjada, W Boujelben

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引用次数: 0

摘要

本研究利用平均场理论（MFT）建立了 Pr0.67Sr0.33MnO3 纳米粒子的磁致效应模型。理论计算围绕居里温度（TC）进行，模拟了几种外加磁场下磁熵变化的温度依赖性。所得结果与使用麦克斯韦关系计算得出的实验数据进行了比较。两种方法之间的差异证实了 MFT 在模拟 Pr0.67Sr0.33MnO3 纳米粒子的磁致性能方面的无效性。这种无效性表明在 TC 附近存在临界波动，这可归因于无序表面和/或磁沮度的存在，并突出了所使用模型的局限性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Magnetic interactions in Pr0.67Sr0.33MnO3 nanoparticles: mean-field theory vs. experiments

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Magnetic interactions in Pr0.67Sr0.33MnO3 nanoparticles: mean-field theory vs. experiments

This study presents the modelling of magnetocaloric effect of Pr_0.67Sr_0.33MnO₃ nanoparticles by using the mean-field theory (MFT). Theoretical calculations were used around the Curie temperature (T_C) to simulate the temperature dependence of magnetic entropy change under several applied magnetic fields. The obtained results were compared with experimental data computed using the Maxwell relation. Discrepancy between the two methods confirm the invalidity of MFT for modelling the magnetocaloric properties of Pr_0.67Sr_0.33MnO₃ nanoparticles. This invalidity suggests the presence of critical fluctuations near the T_C, which can be attributed to the presence of disordered surface and/or magnetic frustration, and highlights the limitation of the used model.

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来源期刊

Bulletin of Materials Science 工程技术-材料科学：综合

CiteScore

3.40

自引率

5.60%

发文量

209

审稿时长

11.5 months

期刊介绍： The Bulletin of Materials Science is a bi-monthly journal being published by the Indian Academy of Sciences in collaboration with the Materials Research Society of India and the Indian National Science Academy. The journal publishes original research articles, review articles and rapid communications in all areas of materials science. The journal also publishes from time to time important Conference Symposia/ Proceedings which are of interest to materials scientists. It has an International Advisory Editorial Board and an Editorial Committee. The Bulletin accords high importance to the quality of articles published and to keep at a minimum the processing time of papers submitted for publication.