通过共振X射线衍射揭示无限层PrNiO2+δ中的两种不同电荷序
Two Distinct Charge Orders in Infinite-layer PrNiO2+δ revealed by Resonant X-ray Diffraction
AI总结：
本研究通过共振X射线散射在无限层PrNiO2+δ薄膜中发现Ni L3边与Pr M5共振对应两种不同的电荷序，并指出过量氧掺杂剂和氧配体在电荷调制中起关键作用。
摘要：
近期在无限层镍酸盐中发现了平移对称性破缺，这引发了人们对其起源、与超导的关系以及与铜酸盐中电荷序比较的极大兴趣。在这里，通过对无限层PrNiO2+δ薄膜进行共振X射线散射测量，我们发现Ni L3吸收边的超晶格反射与Pr M5共振在能量、温度和局部对称性依赖性上存在显著差异，表明尽管具有相同的面内波矢，它们是两种不同的电荷序。考虑到共振反射是在未完全还原的PrNiO2+δ薄膜中观察到的，这些差异可能与过量氧掺杂剂有关。此外，我们的方位角分析表明，氧配体应在Ni L3共振处揭示的电荷调制中发挥关键作用。
英文摘要：
A broken translation symmetry has recently been revealed in infinite-layer nickelates, which has piqued considerable interest in its origin and relation to superconductivity, as well as in its comparison to charge order in cuprates. Here, by performing resonant x-ray scattering measurements in thin films of infinite-layer PrNiO2+δ, we find that the superlattice reflection at the Ni L3 absorption edge differs considerably from that at the Pr M5 resonance in their dependence on energy, temperature, and local symmetry, indicating they are two distinct charge orders despite the same in-plane wavevectors. These dissimilarities might be related to the excess oxygen dopants, considering that the resonant reflections were observed in an incompletely reduced PrNiO2+δ film. In addition, our azimuthal analysis suggests that the oxygen ligands should play a pivotal role in the charge modulation revealed at the Ni L3 resonance.
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