Spin-Orbital Excitations in Ca 2 RuO 4 Revealed by Resonant Inelastic X-Ray Scattering

L. Das; F. Forte; R. Fittipaldi; C. G. Fatuzzo; V. Granata; O. Ivashko; M. Horio; F. Schindler; M. Dantz; Yi Tseng; D. E. McNally; H. M. R?nnow; W. Wan; N. B. Christensen; J. Pelliciari; P. Olalde-Velasco; N. Kikugawa; T. Neupert; A. Vecchione; T. Schmitt; M. Cuoco; J. Chang

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Spin-Orbital Excitations in Ca 2 RuO 4 Revealed by Resonant Inelastic X-Ray Scattering

机译：Ca 2 Ruo 4中的旋转轨道激发通过共振非弹性X射线散射露出

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The strongly correlated insulator Ca 2 RuO 4 is considered as a paradigmatic realization of both spin-orbital physics and a band-Mott insulating phase, characterized by orbitally selective coexistence of a band and a Mott gap. We present a high resolution oxygen K -edge resonant inelastic x-ray scattering study of the antiferromagnetic Mott insulating state of Ca 2 RuO 4 . A set of low-energy (about 80 and 400?meV) and high-energy (about 1.3 and 2.2?eV) excitations are reported, which show strong incident light polarization dependence. Our results strongly support a spin-orbit coupled band-Mott scenario and explore in detail the nature of its exotic excitations. Guided by theoretical modeling, we interpret the low-energy excitations as a result of composite spin-orbital excitations. Their nature unveils the intricate interplay of crystal-field splitting and spin-orbit coupling in the band-Mott scenario. The high-energy excitations correspond to intra-atomic singlet-triplet transitions at an energy scale set by Hund’s coupling. Our findings give a?unifying picture of the spin and orbital excitations in the band-Mott insulator Ca 2 RuO 4 .

机译：强烈相关的绝缘体Ca 2 Ruo 4被认为是旋转轨道物理学和带状绝缘相的视域实现，其特征在于，具有带的甘蓝和斑驳间隙的轨道选择性共存。我们介绍了Ca 2 Ruo 4的反铁磁体薄膜绝缘状态的高分辨率氧气k-edge unelastic X射线散射研究。报告了一组低能量（约80〜400〜400？MEV）和高能量（约1.3和2.2 eV）激发，这表明了强烈的入射光极化依赖性。我们的结果强烈支持旋转轨道耦合带 - MOTT场景，并详细探讨其异国情调激动的性质。以理论建模为指导，我们因复合旋转轨道激动而解释低能量激动。他们的性质推出了在带 - Mott场景中的晶体场分裂和旋转轨道耦合的复杂相互作用。高能量激励对应于由HUND耦合设定的能量级的原子内单态翻序贯转换。我们的调查结果给出了一个？统一带 - Mott Insululator CA 2 Ruo 4中的旋转和轨道激动的画面。

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《Physical Review X》 |2018年第1期|共9页
作者
L. Das; F. Forte; R. Fittipaldi; C. G. Fatuzzo; V. Granata; O. Ivashko; M. Horio; F. Schindler; M. Dantz; Yi Tseng; D. E. McNally; H. M. R?nnow; W. Wan; N. B. Christensen; J. Pelliciari; P. Olalde-Velasco; N. Kikugawa; T. Neupert; A. Vecchione; T. Schmitt; M. Cuoco; J. Chang;
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机译：利用相关材料中间接非弹性X射线散射的共振轮廓揭示选择性激发：观察双杂散散射及其与动态结构因子的关系。

Spin-Orbital Excitations in Ca 2 RuO 4 Revealed by Resonant Inelastic X-Ray Scattering

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