轨道倒置与无限层CaCoO₂中涌现的晶格动力学
Orbital inversion and emergent lattice dynamics in infinite layer CaCoO$_2$
AI总结：
研究无限层CaCoO₂的轨道倒置和晶格动力学，利用XAS和RIXS揭示钙和钴轨道杂化及低能模式异常强度调制。
摘要：
层状钴酸盐CaCoO₂表现出独特的鳞状结构。作为新一类复杂晶格模式的潜在原型，我们利用X射线吸收光谱（XAS）和共振非弹性X射线散射（RIXS）研究其性质。我们的结果揭示了钙4s-和钴3d-轨道之间显著的层间杂化，导致平方平面几何的教科书轨道占据反转。进一步，我们的RIXS数据揭示了强低能模式，其强度随动量转移变化异常，接近准静态响应，暗示电子和/或轨道有序。这些发现表明，CaCoO₂中发现的鳞状结构可能成为设计具有强电子、轨道和晶格相关性的材料的有前景的实验室。
英文摘要：
The layered cobaltate CaCoO$_2$ exhibits a unique herringbone-like structure. Serving as a potential prototype for a new class of complex lattice patterns, we study the properties of CaCoO$_2$ using X-ray absorption spectroscopy (XAS) and resonant inelastic X-ray scattering (RIXS). Our results reveal a significant inter-plane hybridization between the Ca $4s-$ and Co $3d-$orbitals, leading to an inversion of the textbook orbital occupation of a square planar geometry. Further, our RIXS data reveal a strong low energy mode, with anomalous intensity modulations as a function of momentum transfer close to a quasi-static response suggestive of electronic and/or orbital ordering. These findings indicate that the newly discovered herringbone structure exhibited in CaCoO$_2$ may serve as a promising laboratory for the design of materials having strong electronic, orbital and lattice correlations.
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