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首页> 外文期刊>Physical review.B.Condensed matter and materials physics >Noncollinear antiferromagnetic order in the buckled honeycomb lattice of magnetoelectric Co_4Ta_2O_9 determined by single-crystal neutron diffraction
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Noncollinear antiferromagnetic order in the buckled honeycomb lattice of magnetoelectric Co_4Ta_2O_9 determined by single-crystal neutron diffraction

机译：由单晶中子衍射确定的磁电CO_4TA_2O_9的弯曲蜂窝晶片中的非可折叠反铁磁性阶

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摘要

Co_4Ta_2O_9 exhibits a three-dimensional magnetic lattice based on the buckled honeycomb motif. It shows unusual magnetoelectric effects, including the sign change and nonlinearity. These effects cannot be understood without the detailed knowledge of the magnetic structure. Herein, we report neutron diffraction and direction-dependent magnetic susceptibility measurements on Co_4Ta_2O_9 single crystals. Below 20.3 K. we find a long-range antiferromagnetic order in the alternating buckled and flat honeycomb layers of Co~(2+) ions stacked along the c axis. Within experimental accuracy, the magnetic moments lie in the ab plane. They form a canted antiferromagnetic structure with a tilt angle of ～14 at 15 K in the buckled layers, while the magnetic moments in each flat layer are collinear. This is directly evidenced by a finite (0, 0, 3) magnetic Bragg peak intensity, which would be absent in the collinear magnetic order. The magnetic space group is C2′/c. It is different from the previously reported C2/c′ group, also found in the isostructural Co_4Ta_2O_9. The revised magnetic structure successfully explains the major features of the magnetoelectric tensor of Co_4Ta_2O_9 within the framework of the spin-flop model.
机译：CO_4TA_2O_9基于弯曲的蜂窝基序展示了一种三维磁性格子。它显示出不寻常的磁电效应，包括符号变化和非线性。没有磁结构的详细知识，不能理解这些效果。这里，我们报告CO_4TA_2O_9单晶上的中子衍射和方向依赖性磁化率测量。低于20.3 K.我们在沿C轴堆叠的Co〜（2+）离子的交替弯曲和平蜂窝层中找到了远程反铁磁性阶。在实验准确性内，磁矩位于AB平面中。它们在弯曲层中形成具有〜14的倾斜角度的倾斜反铁磁结构，而每个平面层中的磁矩是共线的。这直接通过有限（0,3）磁性布拉格峰强度来证明，这将不存在于共线磁序。磁空间组是C2'/ c。它与先前报道的C2 / C'组不同，也发现在IsostrontuctuctuckuceCo_4ta_2O_9中。经修订的磁结构成功地解释了旋转模式框架内CO_4TA_2O_9的磁电张量的主要特征。

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  • 来源
    《Physical review.B.Condensed matter and materials physics》 |2020年第21期|214404.1-214404.12|共12页
  • 作者

    Sungkyun Choi; Dong Gun Oh; Matthias J. Gutmann; Shangke Pan; Gideok Kim; Kwanghyo Son; Jaewook Kim; Nara Lee; Sang-Wook Cheong; Young Jai Choi; Valery Kiryukhin;

  • 作者单位

    Department of Physics and Astronomy Rutgers University Piscataway New Jersey 08854 USA Max Planck Institute for Solid State Research Heisenbergstrasse 1 70569 Stuttgart Germany;

    Department of Physics Yonsei University Seoul 03722 Korea;

    ISIS Facility Rutherford Appleton Laboratory Chilton Didcot OX11 0QX United Kingdom;

    Department of Physics and Astronomy Rutgers University Piscataway New Jersey 08854 USA Rutgers Center for Emergent Materials Rutgers University Piscataway New Jersey 08854 USA State Key Laboratory Base of Novel Function Materials and Preparation Science School of Material Sciences and Chemical Engineering Ningbo University Ningbo Zhejiang 315211 China;

    Max Planck Institute for Solid State Research Heisenbergstrasse 1 70569 Stuttgart Germany Center for Integrated Nanostructure Physics Institute for Basic Science (IBS). Suwon 16419 Republic of Korea;

    Max Planck Institute for Intelligent Systems Heisenbergstrasse 3 70569 Stuttgart Germany;

    Department of Physics and Astronomy Rutgers University Piscataway New Jersey 08854 USA Rutgers Center for Emergent Materials Rutgers University Piscataway New Jersey 08854 USA Sungkyunkwan University (SKKU) Suwon 16419 Republic of Korea;

    Department of Physics Yonsei University Seoul 03722 Korea;

    Department of Physics and Astronomy Rutgers University Piscataway New Jersey 08854 USA Rutgers Center for Emergent Materials Rutgers University Piscataway New Jersey 08854 USA;

    Department of Physics Yonsei University Seoul 03722 Korea;

    Department of Physics and Astronomy Rutgers University Piscataway New Jersey 08854 USA;

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