AI 中文总结
本研究对中心对称磁斯格明子宿主Gd$_2$PdSi$_3$施加垂直于$c$轴的压缩单轴应力，通过多类测量发现其磁基态为多-q磁有序，解决了该系统磁结构类型的疑问。
AI 中文摘要
我们研究单轴应力对中心对称磁斯格明子化合物Gd$_2$PdSi$_3$的磁有序和电阻率的影响，该化合物具有由磁性Gd$^{3+}$离子的三角晶格层构成的六方晶体结构。已知该化合物在首个场诱导相中会呈现三重-q磁斯格明子晶格相，伴随巨大的拓扑霍尔效应[T. Kurumaji等人，《科学》365卷，914-918页（2019）]。与已确立的场诱导相图像不同，该系统的基态仍有待研究。尽管此前研究报道存在由磁调制波矢${\bf q}=(q,0,0)$（其中$q\sim0.14$）及其等价形式描述的非公度磁调制，但磁结构是单-q结构还是多-q结构仍不明确。本研究中，我们对垂直于$c$轴施加压缩单轴应力的样品进行了磁化、电阻率和中子衍射测量。观测数据显示，该系统未呈现单-q磁有序预期的各向异性磁学与电学性质，表明该系统的磁基态为多-q磁有序。
英文摘要
We investigate effects of uniaxial stress to magnetic orders and electrical resistivity of the centrosymmetric magnetic skyrmion compound Gd$_2$PdSi$_3$, which has a hexagonal crystal structure composed of triangular lattice layers of magnetic Gd$^{3+}$ ions. This compound is known to exhibit the triple-$q$ magnetic skyrmion lattice phase with a giant topological Hall effect in the first field induced phase [T. Kurumaji $\textit{et al}$. Science $\textbf{365}$, 914-918 (2019)]. In contrast to the established picture of the field-induced phase, the ground state of this system still remains to be studied. Although previous studies reported the existence of the incommensurate magnetic modulations described by a magnetic modulation wave vector ${\bf q}=(q,0,0)$ where $q\sim 0.14$ and its equivalents, it is still unclear whether the magnetic structure is a single-$q$ structure or a multiple-$q$ structure. In the present study, we performed magnetization, resistivity and neutron diffraction measurements with a compressive uniaxial stress applied perpendicular to the $c$ axis. The observed data revealed that the system did not exhibit anisotropic magnetic and electric properties expected from a single-$q$ magnetic order, suggesting that the magnetic ground state of this system is a multi-$q$ magnetic order.
Comments7 pages, 4 figures
