标题： 通过超快共振X射线衍射研究相干原子运动期间电荷和结构贡献的分离 显示英文标题

标题： Disentangling charge and structural contributions during coherent atomic motions studied by ultrafast resonant x-ray diffraction

摘要： 我们报告了在混合价态锰氧化物中光诱导抑制电荷序和轨道序过程中电荷序和结构响应的超快动力学。 采用低于和在Mn K吸收边以下的飞秒时间分辨共振X射线衍射，我们提出了一种方法来区分Pr0.5Ca0.5MnO3薄膜中的瞬态电荷序和结构动力学。 基于静态共振散射谱，我们提取了电荷有序的Mn3+和Mn4+离子的色散校正，使我们能够在光激发后将纯电荷序的瞬态贡献与结构贡献从散射振幅中分离出来。 我们在约2.3 THz处发现了一个相干结构模式，该模式主要调制晶格，但对电荷序影响不大，这证实了电荷序是联合电荷、轨道和结构转变的驱动力的图像。 显示英文摘要

摘要： We report on the ultrafast dynamics of charge order and structural response during the photoinduced suppression of charge and orbital order in a mixed-valence manganite. Employing femtosecond time-resolved resonant x-ray diffraction below and at the Mn K absorption edge, we present a method to disentangle the transient charge order and structural dynamics in thin films of Pr0.5Ca0.5MnO3. Based on the static resonant scattering spectra, we extract the dispersion correction of charge ordered Mn3+ and Mn4+ ions, allowing us to separate the transient contributions of purely charge order from structural contributions to the scattering amplitude after optical excitation. Our finding of a coherent structural mode at around 2.3 THz, which primarily modulates the lattice, but does not strongly affect the charge order, confirms the picture of the charge order being the driving force of the combined charge, orbital and structural transition.