论文标题
菱形天际晶格，与正交结构失真相结合，$ _ {4} $
Rhombic skyrmion lattice coupled with orthorhombic structural distortion in EuAl$_{4}$
论文作者
论文摘要
中心对称四方巡回磁铁EUAL $ _ {4} $显示出复杂的磁性相图，包括外部磁场中的菱形和方形 - 天线 - 晶状体（SKL）阶段。在这里，我们通过一种新设计的纤维 - 布拉吉胶化技术对$ _ {4} $的多轴扩张研究进行了补充，该技术辅以一个谐振X射线散射实验，揭示了各向异性磁磁特性和与连续相位转换相关的磁磁效应。发现菱形和方形SKL阶段分别具有$ \ sim $ 0.10％和$ \ sim $ 0.03％的$ 0.03％的正常结构失真，分别在$ ab $平面内。我们建议，旋转系统与晶格变形之间的耦合对于$ _ {4} $的结构不稳定性至关重要，从而产生了具有自发性旋转对称性破坏的各种拓扑旋转纹理，以及通过单十型旋转阶段的潜在可控性。
The centrosymmetric tetragonal itinerant magnet EuAl$_{4}$ exhibits an intricate magnetic phase diagram including rhombic and square skyrmion-lattice (SkL) phases in the external magnetic field. Here, we report a multi-axis dilatometric investigation of EuAl$_{4}$ by means of a newly designed fiber-Bragg-grating technique complemented by a resonant x-ray scattering experiment, revealing anisotropic magnetostriction and magnetovolume effect associated with successive phase transitions. The rhombic and square SkL phases are found to possess $\sim$0.10% and $\sim$0.03% orthorhombic structural distortion within the $ab$ plane, respectively. We propose that the coupling between the spin system and the lattice deformation should be essential for the structural instability in EuAl$_{4}$, yielding a rich variety of topological spin textures with spontaneous rotational-symmetry breaking as well as a potential controllability of the SkL phases by uniaxial stress or pressure.
