论文标题
Skyrmion材料的特定网站电子和磁激励Cu $ _2 $ OSEO $ _3 $
Site-specific electronic and magnetic excitations of the skyrmion material Cu$_2$OSeO$_3$
论文作者
论文摘要
Mott-Insulator Cu $ _2 $ OSEO $ _3 $中Skyrmions的表现源自磁性和电子能量尺度之间的微妙平衡。由于这些相互交织的耦合，两个对称性授权磁离子Cu-I和Cu-II将键合成旋转s = 1纠缠的四面体。但是，由于该系统的复杂性，概念化了该材料的非常规性能和竞争相互作用的能量是一项艰巨的任务。在这里，我们将X射线吸收光谱和谐振非弹性X射线散射结合在一起，以发现Cu $ _2 $ _2 $ OSOO $ _3 $的电子和磁激发与站点特异性。我们量化了Cu-I和Cu-II的3D晶体场分裂的能量，这是为了优化模型汉密尔顿人的基础。此外，我们推出了特定位点特异性磁模式，表明单个旋转特征保留在纠缠四面体的图片中。因此，我们的结果提供了验证描述Cu $ _2 $ oseo $ _3 $相互作用的理论的实验限制，突出显示了共振光谱的站点选择功能
The manifestation of skyrmions in the Mott-insulator Cu$_2$OSeO$_3$ originates from a delicate balance between magnetic and electronic energy scales. As a result of these intertwined couplings, the two symmetry-inequivalent magnetic ions, Cu-I and Cu-II, bond into a spin S=1 entangled tetrahedron. However, conceptualizing the unconventional properties of this material and the energy of the competing interactions is a challenging task due the complexity of this system. Here we combine X-ray Absorption Spectroscopy and Resonant Inelastic X-ray Scattering to uncover the electronic and magnetic excitations of Cu$_2$OSeO$_3$ with site-specificity. We quantify the energies of the 3d crystal-field splitting for both Cu-I and Cu-II, fundamental to optimize model Hamiltonians. Additionally, we unveil a site-specific magnetic mode, indicating that individual spin character is preserved within the entangled-tetrahedron picture. Our results thus provide experimental constraint for validating theories that describe the interactions of Cu$_2$OSeO$_3$, highlighting the site-selective capabilities of resonant spectroscopies
