Exploring the effects of substitution site selectivity on structural transition and magnetocaloric effect in MnCoGe alloy

IF 2.3 3区物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY

Physics Letters A Pub Date : 2025-04-03 DOI:10.1016/j.physleta.2025.130503

Hao Zhang, Lifu Bao, Xudong Zhang, Yongzhuo Sang, Yunzhe Ding, Jilong Gao, Danan Zhao, Hongwei Zhang, Ming Tian, Yuting Bai, Zhijie Li

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引用次数: 0

Abstract

This study investigates the effects of Ga substitution at three distinct lattice sites (Mn, Co, Ge) in MnCoGe alloys to elucidate the relationship between substitution sites and phase transition regulation. The results demonstrate site-dependent efficiency in phase transition control: Ga substitution at Mn sites effectively lowers structural transition temperatures while enabling coupled magneto-structural transitions, causing the large magnetocaloric effects; substitution at Co sites exhibits the unusual capability to only tune the structural transition of cooling process into the Curie temperature window; conversely, substitution at Ge sites shows negligible phase transition modulation. These findings systematically map substitution site efficacy to transition tuning capabilities and their resultant MCE magnitudes, providing critical guidance for strategic site selection targeting enhanced magnetocaloric performance in solid-state refrigeration systems.

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本研究调查了锰钴锗合金中三个不同晶格位点（锰、钴、锗）的镓替代效应，以阐明替代位点与相变调控之间的关系。结果表明，相变控制的效率与位点有关：锰位点上的镓取代有效地降低了结构转变温度，同时实现了磁结构耦合转变，从而产生了巨大的磁致效应；钴位点上的取代表现出不同寻常的能力，只能将冷却过程中的结构转变调控到居里温度窗口；相反，Ge位点上的取代对相变的调控可以忽略不计。这些发现系统地将取代位点的功效与转变调谐能力及其产生的 MCE 幅值进行了映射，为固态制冷系统中旨在增强磁致性能的战略位点选择提供了重要指导。

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

Physics Letters A 物理-物理：综合

CiteScore

5.10

自引率

3.80%

发文量

493

审稿时长

30 days

期刊介绍： Physics Letters A offers an exciting publication outlet for novel and frontier physics. It encourages the submission of new research on: condensed matter physics, theoretical physics, nonlinear science, statistical physics, mathematical and computational physics, general and cross-disciplinary physics (including foundations), atomic, molecular and cluster physics, plasma and fluid physics, optical physics, biological physics and nanoscience. No articles on High Energy and Nuclear Physics are published in Physics Letters A. The journal''s high standard and wide dissemination ensures a broad readership amongst the physics community. Rapid publication times and flexible length restrictions give Physics Letters A the edge over other journals in the field.