标题： 偏振依赖的共振非弹性X射线散射研究在YBa$_2$Cu$_3$O$_{7-x}$的铜L边和氧K边 显示英文标题

标题： Polarization-dependent resonant inelastic X-ray scattering study at the Cu L and O K-edge of YBa$_2$Cu$_3$O$_{7-x}$

摘要： 我们使用偏振依赖的X射线吸收和共振非弹性X射线散射对高温超导体（HTSC）YBa2Cu3O7-x（YBCO）进行了研究。 使用同步辐射进行的高分辨率测量与在YBCO的Cu 2p3/2边缘进行的准原子多重态方法计算进行了比较。 我们采用单杂质安德森模型中的多重态方法来再现和理解YBCO中局域低能激发的特性。 我们在O K RIXS中观察到约0.5 eV处的一个明显峰。 该峰表现出对掺杂、入射能量和动量转移的依赖性，表明其起源不同于之前讨论的铜氧化物双磁子。 因此，我们将它归因于张-李带之间和/或上 Hubbard 带之间的多磁子激发。 显示英文摘要

摘要： We present a study on the high-Tc superconductor (HTSC) YBa2Cu3O7-x (YBCO) using polarization-dependent X-ray absorption and resonant inelastic X-ray scattering. High-resolution measurements using synchrotron-radiation are compared with calculations using a quasi-atomic multiplet approach performed at the Cu 2p3/2-edge of YBCO. We use a multiplet approach within the single impurity Anderson model to reproduce and understand the character of the localized low-energy excitations in YBCO. We observe a distinct peak at about 0.5 eV in O K RIXS. This peak shows dependence on doping, incident energy, and momentum transfer that suggests that it has a different origin than the previously discussed cuprate bi-magnons. Therefore, we assign it to multi-magnon excitations between the Zhang Rice bands and/or the Upper Hubbard bands, respectively.