Evidence of rotational and tilting disorder of ReO6 octahedra in single crystals of a 5d1 double perovskite Ba2CaReO6

IF 3 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Magnetism and Magnetic Materials Pub Date : 2025-09-23 DOI:10.1016/j.jmmm.2025.173516

Alasdair Nicholls , Jian-Rui Soh , Yikai Yang , Alessandro Bombardi , Daigorou Hirai , Henrik M. Rønnow , Ivica Živković

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引用次数: 0

Abstract

We present results of an experimental study on single crystals of a 5d

^{1}

double perovskite Ba₂CaReO₆. Magnetization measurements reveal a weak splitting between zero-field-cooled and field-cooled protocols below 12 K. At magnetic fields above 1 T the splitting is absent and the magnetic susceptibility is featureless. A detailed specific heat study in a wide temperature range and comprising different heat pulses did not reveal any indication of a thermodynamic phase transition. At low temperatures we do observe specific heat deviating from a phonon background, leading to a total electronic entropy release of

\sim R l n 2

. Resonant and non-resonant x-ray diffraction of characteristic Bragg peaks indicates a significant presence of disorder, potentially related to random tilts and rotations of rigid ReO₆ octahedra.

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5d1双钙钛矿Ba2CaReO6单晶中ReO6八面体旋转和倾斜无序性的证据

本文报道了5d1双钙钛矿Ba2CaReO6单晶的实验研究结果。磁化测量显示，在12k以下，零场冷却和场冷却协议之间存在弱分裂。在1t以上的磁场中，不存在分裂现象，磁化率也没有特征。一个详细的比热研究，在广泛的温度范围内，包括不同的热脉冲没有揭示热力学相变的任何迹象。在低温下，我们确实观察到比热偏离声子背景，导致总电子熵释放~ Rln2。特征布拉格峰的共振和非共振x射线衍射表明存在明显的无序，可能与刚性ReO6八面体的随机倾斜和旋转有关。

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

Journal of Magnetism and Magnetic Materials 物理-材料科学：综合

CiteScore

5.30

自引率

11.10%

发文量

1149

审稿时长

59 days

期刊介绍： The Journal of Magnetism and Magnetic Materials provides an important forum for the disclosure and discussion of original contributions covering the whole spectrum of topics, from basic magnetism to the technology and applications of magnetic materials. The journal encourages greater interaction between the basic and applied sub-disciplines of magnetism with comprehensive review articles, in addition to full-length contributions. In addition, other categories of contributions are welcome, including Critical Focused issues, Current Perspectives and Outreach to the General Public. Main Categories: Full-length articles: Technically original research documents that report results of value to the communities that comprise the journal audience. The link between chemical, structural and microstructural properties on the one hand and magnetic properties on the other hand are encouraged. In addition to general topics covering all areas of magnetism and magnetic materials, the full-length articles also include three sub-sections, focusing on Nanomagnetism, Spintronics and Applications. The sub-section on Nanomagnetism contains articles on magnetic nanoparticles, nanowires, thin films, 2D materials and other nanoscale magnetic materials and their applications. The sub-section on Spintronics contains articles on magnetoresistance, magnetoimpedance, magneto-optical phenomena, Micro-Electro-Mechanical Systems (MEMS), and other topics related to spin current control and magneto-transport phenomena. The sub-section on Applications display papers that focus on applications of magnetic materials. The applications need to show a connection to magnetism. Review articles: Review articles organize, clarify, and summarize existing major works in the areas covered by the Journal and provide comprehensive citations to the full spectrum of relevant literature.