カイラル磁性体における磁気スキルミオン格子構造の安定化

手性磁体中磁性斯格明子晶格结构的稳定性

• 批准号: 17F17706
• 负责人: 佐藤 卓
• 金额: $ 0.77万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for JSPS Fellows
• 财政年份: 2017
• 资助国家: 日本
• 起止时间: 2017-04-26 至 2019-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17F17706/
• 关键词: Skyrmion; Antiferromagnetism; Frustrated magnetism; Chiral magnet; Neutron scattering

The investigation of the stabilization of skyrmion-lattice was focused on two chiral materials: Cu2OSeO3 (ferromagnetic skyrmion), and CaBaCo2FeO7 (candidate for antiferromagnetic skyrmion). The dependence on the history and rate of temperature and field application when stabilizing the skyrmion-lattice in Cu2OSeO3 was evidenced. Furthermore, indications for higher order peaks were discovered. A new method was developed and applied successfully to discern these from double scattering. A manuscript has been prepared and can be expected later this year. The pursuit of more detailed effects lead to an improvement of the data reduction at the instrument TAIKAN, J-Parc. Applying the analysis techniques for Cu2OSeO3 helped discerning the impact of electric current on the skyrmion lattice in MnSi.The study of the general magnetic properties of CaBaCo2Fe2O7 was completed. Two types of order were separated using neutron scattering, a short range and a long range one. The first one is describable by a Heisenberg nearest neighbor model. Yet, the latter one shows additional precursors of a long-periodic spin structure, which were indeed found favorable using symmetry analysis. Another neutron experiment revealed the long range order to be a superposition of two periodic structures coexisting in a wide range of the AFM phase. While the longer periodic structure vanishes at lower temperatures, the remaining modulation resembles a skyrmion-lattice like spin structure. A manuscript on these features is in preparation. A key experiment was scheduled however postponed.

斯格明子晶格稳定性的研究主要集中在两种手性材料：Cu2OSeO3（铁磁斯格明子）和CaBaCo2FeO7（反铁磁斯格明子的候选材料）。证明了稳定 Cu2OSeO3 中斯格明子晶格时对温度和现场应用的历史和速率的依赖性。此外，还发现了更高阶峰的迹象。开发并成功应用了一种新方法来从双散射中辨别这些。手稿已经准备好，预计将于今年晚些时候发布。为了追求更详细的效果，TAIKAN、J-Parc 仪器的数据缩减得到了改进。应用Cu2OSeO3分析技术有助于识别电流对MnSi中斯格明子晶格的影响。完成了CaBaCo2Fe2O7一般磁性能的研究。使用中子散射来分离两种类型的有序：短程有序和长程有序。第一个可以用海森堡最近邻模型来描述。然而，后一个显示了长周期自旋结构的其他前体，使用对称分析确实发现了这种结构是有利的。另一项中子实验揭示了长程有序是在 AFM 相的大范围内共存的两种周期性结构的叠加。虽然较长的周期性结构在较低的温度下消失，但剩余的调制类似于斯格明子晶格的自旋结构。关于这些功能的手稿正在准备中。计划进行一项关键实验，但被推迟了。

项目成果

Controlling the stoichiometry of the triangular lattice antiferromagnet Li1+xZn2-yMo3O8

控制三角晶格反铁磁体 Li1 xZn2-yMo3O8 的化学计量

• DOI: 10.1016/j.jssc.2018.12.064
• 发表时间: 2019
• 期刊: Journal of Solid State Chemistry
• 影响因子: 3.3
• 作者: Sandvik Kim E.;Okuyama Daisuke;Nawa Kazuhiro;Avdeev Maxim;Sato Taku J.
• 通讯作者: Sato Taku J.

Neutron diffraction study and theoretical analysis of the antiferromagnetic order and diffuse scattering in the layered Kagome system CaBaCo2Fe2O7

层状 Kagome 体系 CaBaCo2Fe2O7 中的中子衍射研究及反铁磁序和漫散射的理论分析

• 发表时间: 2018
• 作者: J. D. Reim;E. Ros en;O. Zaharko;M. Mostovoy;M. Valldor;T. J. Sato;W. Schweika
• 通讯作者: W. Schweika

Julich Center for Neutron Science/Peter Grunberg Institute/JARA-FIT(ドイツ)

尤利希中子科学中心/Peter Grunberg Institute/JARA-FIT（德国）

Paul Scherrer Institute(スイス)

保罗谢勒研究所（瑞士）

University of Groningen(Netherlands)

格罗宁根大学（荷兰）