W Mabrouki, A Krichene, N Chniba Boudjada, W Boujelben
{"title":"Pr0.67Sr0.33MnO3 纳米粒子中的磁相互作用：均场理论与实验","authors":"W Mabrouki, A Krichene, N Chniba Boudjada, W Boujelben","doi":"10.1007/s12034-024-03301-5","DOIUrl":null,"url":null,"abstract":"<div><p>This study presents the modelling of magnetocaloric effect of Pr<sub>0.67</sub>Sr<sub>0.33</sub>MnO<sub>3</sub> nanoparticles by using the mean-field theory (MFT). Theoretical calculations were used around the Curie temperature (<i>T</i><sub>C</sub>) 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<sub>0.67</sub>Sr<sub>0.33</sub>MnO<sub>3</sub> nanoparticles. This invalidity suggests the presence of critical fluctuations near the <i>T</i><sub>C</sub>, which can be attributed to the presence of disordered surface and/or magnetic frustration, and highlights the limitation of the used model.</p></div>","PeriodicalId":502,"journal":{"name":"Bulletin of Materials Science","volume":"47 3","pages":""},"PeriodicalIF":1.9000,"publicationDate":"2024-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Magnetic interactions in Pr0.67Sr0.33MnO3 nanoparticles: mean-field theory vs. experiments\",\"authors\":\"W Mabrouki, A Krichene, N Chniba Boudjada, W Boujelben\",\"doi\":\"10.1007/s12034-024-03301-5\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>This study presents the modelling of magnetocaloric effect of Pr<sub>0.67</sub>Sr<sub>0.33</sub>MnO<sub>3</sub> nanoparticles by using the mean-field theory (MFT). Theoretical calculations were used around the Curie temperature (<i>T</i><sub>C</sub>) 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<sub>0.67</sub>Sr<sub>0.33</sub>MnO<sub>3</sub> nanoparticles. This invalidity suggests the presence of critical fluctuations near the <i>T</i><sub>C</sub>, which can be attributed to the presence of disordered surface and/or magnetic frustration, and highlights the limitation of the used model.</p></div>\",\"PeriodicalId\":502,\"journal\":{\"name\":\"Bulletin of Materials Science\",\"volume\":\"47 3\",\"pages\":\"\"},\"PeriodicalIF\":1.9000,\"publicationDate\":\"2024-08-17\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Bulletin of Materials Science\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://link.springer.com/article/10.1007/s12034-024-03301-5\",\"RegionNum\":4,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"MATERIALS SCIENCE, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Bulletin of Materials Science","FirstCategoryId":"88","ListUrlMain":"https://link.springer.com/article/10.1007/s12034-024-03301-5","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
Magnetic interactions in Pr0.67Sr0.33MnO3 nanoparticles: mean-field theory vs. experiments
This study presents the modelling of magnetocaloric effect of Pr0.67Sr0.33MnO3 nanoparticles by using the mean-field theory (MFT). Theoretical calculations were used around the Curie temperature (TC) 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 Pr0.67Sr0.33MnO3 nanoparticles. This invalidity suggests the presence of critical fluctuations near the TC, which can be attributed to the presence of disordered surface and/or magnetic frustration, and highlights the limitation of the used model.
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.
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