论文标题
室温kagome Magnet中的拓扑磁杆带
Topological magnon bands in a room temperature Kagome magnet
论文作者
论文摘要
在过去的几年中，拓扑镁是一个充满活力的研究领域。在许多理论建议和有限的实验研究中，铁磁kagome晶格是最阐明的系统之一。在这里，我们报告了YMN6SN6的中子散射研究，YMN6SN6是一种由铁磁kagome平面组成的金属系统。该系统在冷却沿平面外方向的不可固定性时，经历了相应到均衡的抗铁磁相变。我们在受对称性保护的k点上观察到木元带隙开口，并将此特征归因于反对称的dzyaloshinskii-moriya（DM）相互作用。我们的观察结果支持在同化的共线和不固定的共面磁性方面存在拓扑dirac木元素，这通过对称分析进一步证实了。这一发现使YMN6SN6成为室温镁旋转型应用程序的有前途的候选人。
Topological magnon is a vibrant research field gaining more and more attention in the past few years. Among many theoretical proposals and limited experimental studies, ferromagnetic Kagome lattice emerges as one of the most elucidating systems. Here we report neutron scattering studies of YMn6Sn6, a metallic system consisting of ferromagnetic Kagome planes. This system undergoes a commensurate-to-incommensurate antiferromagnetic phase transition upon cooling with the incommensurability along the out-of-plane direction. We observe magnon band gap opening at the symmetry-protected K points and ascribe this feature to the antisymmetric Dzyaloshinskii-Moriya (DM) interactions. Our observation supports the existence of topological Dirac magnons in both the commensurate collinear and incommensurate coplanar magnetic orders, which is further corroborated by symmetry analysis. This finding places YMn6Sn6 as a promising candidate for room-temperature magnon spintronics applications.
