Multiferrocity in spin chain based polycrystalline Sm2BaCoO5

IF 2.5 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Magnetism and Magnetic Materials Pub Date : 2024-09-21 DOI:10.1016/j.jmmm.2024.172545

Sanjay Kumar Upadhyay , Shivani Kulasari , Rosni Roy , Sagar Sen , Rajib Mondal

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Abstract

Sm₂BaCoO₅, a spin chain based polycrystalline compound which crystallize in orthorhombic structure (space group, Immm), is known to order antiferromagnetically close to 38 K. As motivated by 1) its Tb analogues [1] which show giant magneto-dielectric coupling and a new type-II multiferroic and 2) recently discovered multiferroicity in Sm₂BaMO₅ (M=Ni and Cu) compounds [2], [3], detailed dielectric, ferroelectric and magneto-electric measurements have been carried out for Sm₂BaCoO₅. Magnetic and heat capacity measurements confirm the antiferromagnetic ordering at around 38 K. Interestingly ferroelectric transition also occurs around 38 K as revealed by frequency independent dielectric data as well as pyro-current measurements in various protocols. Therefore, the presented experimental results show that spin chain oxide Sm₂BaCoO₅ is new type-II multiferroic and we have identified R₂BaCoO₅ (R=Tb, Sm)- spin chain based cobaltates, is the new multiferroic series, so far unexplored.

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基于自旋链的多晶 Sm2BaCoO5 的多铁性

Sm2BaCoO5 是一种基于自旋链的多晶化合物，以正交菱形结构（空间群为 Immm）结晶，在接近 38 K 的温度下具有反铁磁性。由于 1) 其铽类似物 [1] 显示出巨大的磁介电耦合和新的 II 型多铁性，以及 2) 最近在 Sm2BaMO5（M=镍和铜）化合物中发现的多铁性 [2], [3]，我们对 Sm2BaCoO5 进行了详细的介电、铁电和磁电测量。有趣的是，铁电转换也发生在开氏 38 度左右，这是由频率无关的介电数据以及在不同协议下的热释电流测量所揭示的。因此，实验结果表明，自旋链氧化物 Sm2BaCoO5 是新的第二类多铁性物质，我们还发现了 R2BaCoO5（R=Tb，Sm）--基于自旋链的钴酸盐，是迄今为止尚未开发的新的多铁性系列。

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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.