论文标题
平方晶格触发的磁激发：BA $ _2 $ IRO $ _4 $和SR $ _2 $ IRO $ _4 $之间的对比度
Magnetic Excitations in Square Lattice Iridates: Contrast between Ba$_2$IrO$_4$ and Sr$_2$IrO$_4$
论文作者
论文摘要
我们报告了对BA $ _2 $ _2 $ IRO $ _4 $的超薄外在薄膜的共振非弹性X射线散射（RIX）的研究，并将其低能磁性和旋转轨道激发与姊妹化合物SR $ $ _2 $ iro $ _4 $ _4 $ _4 $。由于180 $^\ circ $ ir-o-o-ir债券，在ba $ _2 $ _2 $ iro $ _4 $中，磁杆和旋转轨道的带宽明显更大，因此很难将这两种类型的激发描述为单独的定义良好的准粒子。发现两种激发对外延菌株的作用都非常敏感。此外，正如最近的理论研究所预测的那样，我们发现在ba $ _2 $ _2 $ _2 $ _2 $ _2 $ _4 $中观察到的D级反转，如最近的理论研究所示。我们的结果表明，BA $ _2 $ IRO $ _4 $的磁性特性与SR $ _2 $ IRO $ _4 $的磁性大不相同，这表明需要对这些材料进行更仔细的检查，并考虑到电子案例。
We report a resonant inelastic x-ray scattering (RIXS) investigation of ultra-thin epitaxial films of Ba$_2$IrO$_4$, and compare their low energy magnetic and spin-orbit excitations to those of their sister compound Sr$_2$IrO$_4$. Due to the 180$^\circ$ Ir-O-Ir bond, the bandwidth of the magnon and spin-orbiton is significantly larger in Ba$_2$IrO$_4$, making it difficult to describe these two types of excitations as separate well-defined quasiparticles. Both types of excitations are found to be quite sensitive to the effect of epitaxial strain. In addition, we find that the d-level inversion observed in Sr$_2$IrO$_4$ is absent in Ba$_2$IrO$_4$, as predicted in recent theoretical studies. Our results illustrate that the magnetic properties of Ba$_2$IrO$_4$ are substantially different from those of Sr$_2$IrO$_4$, suggesting that these materials need to be examined more carefully with electron itinerancy taken into account.
