论文标题
Sr $ _ {2} $ ruo $ _ {4} $中的独特的旋转和轨道动力学
Distinct spin and orbital dynamics in Sr$_{2}$RuO$_{4}$
论文作者
论文摘要
非常规超导体SR $ _2 $ ruo $ _4 $长期以来一直是相关电子材料理论的基准。超导配对机制的确定需要有关集体骨气激发作为库珀配对的潜在介体的详细实验信息。我们已经使用RU $ L_3 $ - 边缘谐振非弹性X射线散射来获取整个Brillouin区域上SR $ _2 $ ruo $ _4 $的电子激发的全面地图。我们观察到与截然不同的能量尺度相关的分散旋转和轨道激发的多个分支。在动态平均场理论中计算出的自旋和轨道动力响应函数与实验数据非常吻合。我们的结果突出了Sr $ _ {2} $ ruo $ _ {4} $的hund金属性质，并提供了关键信息，以理解其非常规超导性。
The unconventional superconductor Sr$_2$RuO$_4$ has long served as a benchmark for theories of correlated-electron materials. The determination of the superconducting pairing mechanism requires detailed experimental information on collective bosonic excitations as potential mediators of Cooper pairing. We have used Ru $L_3$-edge resonant inelastic x-ray scattering to obtain comprehensive maps of the electronic excitations of Sr$_2$RuO$_4$ over the entire Brillouin zone. We observe multiple branches of dispersive spin and orbital excitations associated with distinctly different energy scales. The spin and orbital dynamical response functions calculated within the dynamical mean-field theory are in excellent agreement with the experimental data. Our results highlight the Hund metal nature of Sr$_{2}$RuO$_{4}$ and provide key information for the understanding of its unconventional superconductivity.
