Improving the Magnetocaloric Effect of a Composite Based on Pr0.8Sr0.2MnO3 Compound

IF 1.1 3区 物理与天体物理 Q4 PHYSICS, APPLIED Journal of Low Temperature Physics Pub Date : 2024-08-24 DOI:10.1007/s10909-024-03199-7
A. Ben Jazia Kharrat, W. Boujelben
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Abstract

In this research work, samples of Pr0.8Sr0.2MnO3 were prepared using two methods: the conventional high-temperature ceramic method (sample R1) and the sol–gel method (sample R2) in order to form a composite. The Curie temperatures were found to be 161 K and 210 K for R1 and R2, respectively. We conducted a theoretical investigation of the magnetic and magnetocaloric (MC) properties of a composite constructed from R1 and R2 compounds to enhance the MC effect.The results suggest that our composite, with a Curie temperature evaluated at 190 K, could be a potential candidate for magnetic refrigeration. Refined values of the critical exponents β, γ, and δ, determined from the modified Arrott plots and the Kouvel–Fisher method, indicate that the behavior of the composite compound is consistent with the 3D Heisenberg model for T ≤ TC and with the mean-field model for T > TC.

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改善基于 Pr0.8Sr0.2MnO3 复合物的复合材料的磁ocaloric 效应
在这项研究工作中,采用两种方法制备了 Pr0.8Sr0.2MnO3 样品:传统高温陶瓷法(样品 R1)和溶胶凝胶法(样品 R2),以形成一种复合材料。发现 R1 和 R2 的居里温度分别为 161 K 和 210 K。我们对由 R1 和 R2 复合物制成的复合材料的磁性和磁致冷(MC)特性进行了理论研究,以增强 MC 效应。结果表明,我们的复合材料居里温度为 190 K,可能成为磁制冷的潜在候选材料。根据修正的阿罗特图和库维尔-费舍尔法确定的临界指数β、γ和δ的改进值表明,复合材料的行为在T ≤ TC时符合三维海森堡模型,在T > TC时符合平均场模型。
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来源期刊
Journal of Low Temperature Physics
Journal of Low Temperature Physics 物理-物理:凝聚态物理
CiteScore
3.30
自引率
25.00%
发文量
245
审稿时长
1 months
期刊介绍: The Journal of Low Temperature Physics publishes original papers and review articles on all areas of low temperature physics and cryogenics, including theoretical and experimental contributions. Subject areas include: Quantum solids, liquids and gases; Superfluidity; Superconductivity; Condensed matter physics; Experimental techniques; The Journal encourages the submission of Rapid Communications and Special Issues.
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