Magnetocaloric effect of LiErP4O12 single crystal exhibiting competing ferromagnetic and anti-ferromagnetic interactions

IF 2.4 4区物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Current Applied Physics Pub Date : 2024-10-04 DOI:10.1016/j.cap.2024.10.004

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Abstract

In this paper, we discuss the magnetic behavior and magnetocaloric effect of lithium erbium tetraphosphate (LiErP₄O₁₂) single crystal in the temperature range 2–85 K under magnetic fields up to 50 kOe. Detailed investigation of the temperature-dependent magnetization M(T) proves an existence of magnetic ordering below T_m, which has been estimated as a minimum in the dM/dT vs. T dependence. Above T_m, LiErP₄O₁₂ possesses paramagnetic behavior and its magnetic susceptibility follows the Curie-Weiss law giving a higher value of the effective magnetic moment of Er³⁺ compared to the theoretical one. This could be due to the Kramers spin degeneracy and the Stark structure of multiplets. Under an applied field H = 50 kOe, the maximum value of the magnetic-entropy change at 2 K reaches about 15 J/kgK, corresponding to a relative-cooling-power value of ∼343 J/kg. Assessments of the magnetic ordering exponent n and N(T, H) data prove LiErP₄O₁₂ exhibiting short-range magnetic order. Due to the absence of magnetic hysteresis and large magnetocaloric response, we believe that LiErP₄O₁₂ could be a promising candidate for magnetic-cooling applications in liquefying hydrogen and ³He isotope.

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表现出竞争性铁磁和反铁磁相互作用的 LiErP4O12 单晶的磁ocaloric 效应

本文讨论了四磷酸铒锂（LiErP4O12）单晶体在磁场高达 50 kOe 的情况下，在 2-85 K 温度范围内的磁性行为和磁致效应。对随温度变化的磁化 M(T) 的详细研究证明，在低于 Tm 时存在磁有序性，这被估计为 dM/dT 与 T 的关系中的最小值。高于 Tm 时，LiErP4O12 具有顺磁性，其磁感应强度遵循居里-韦斯定律，与理论值相比，Er3+ 的有效磁矩值更高。这可能是由于克拉默自旋退化和多子的斯塔克结构造成的。在外加磁场 H = 50 kOe 的条件下，2 K 时的磁熵变化最大值约为 15 J/kgK，对应的相对冷却功率值为 ∼343 J/kg。磁有序指数 n 和 N（T，H）数据的评估证明 LiErP4O12 具有短程磁有序性。由于LiErP4O12不存在磁滞和较大的磁热反应，我们认为它有希望成为液化氢和3He同位素的磁制冷应用的候选材料。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Current Applied Physics 物理-材料科学：综合

CiteScore

4.80

自引率

0.00%

发文量

213

审稿时长

33 days

期刊介绍： Current Applied Physics (Curr. Appl. Phys.) is a monthly published international journal covering all the fields of applied science investigating the physics of the advanced materials for future applications. Other areas covered: Experimental and theoretical aspects of advanced materials and devices dealing with synthesis or structural chemistry, physical and electronic properties, photonics, engineering applications, and uniquely pertinent measurement or analytical techniques. Current Applied Physics, published since 2001, covers physics, chemistry and materials science, including bio-materials, with their engineering aspects. It is a truly interdisciplinary journal opening a forum for scientists of all related fields, a unique point of the journal discriminating it from other worldwide and/or Pacific Rim applied physics journals. Regular research papers, letters and review articles with contents meeting the scope of the journal will be considered for publication after peer review. The Journal is owned by the Korean Physical Society.