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arXiv 1709.02777physics.ins-detcond-mat.str-el
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亚10 meV能量分辨率的石英基平晶共振非弹性X射线散射谱仪

Quartz-based flat-crystal resonant inelastic x-ray scattering spectrometer with sub-10 meV energy resolution

Jungho Kim, D. Casa, Ayman Said, Richard Krakora, B. J. Kim, Elina Kasman, Xianrong Huang, T. Gog

摘要:

共振非弹性X射线散射(RIXS)光谱仪的能量分辨率的不断提高是至关重要的,以履行这一技术在基础和技术重要性的材料中的电子动力学研究的潜力。特别是,RIXS是非弹性中子散射的唯一替代工具,能够提供完全动量分辨的磁性材料的动态自旋结构的信息,但限于系统的磁激发能尺度是可比的能量分辨率。最先进的球形切割晶体分析仪光学器件提供的能量分辨率高达25 meV,但已经达到其理论极限。在这里,我们展示了一种新的子10 meV RIXS光谱仪的基础上,在Ir-L $_3$吸收边(11.215 $\sim$ keV),实现了3.9 $\sim$ meV,非常接近3.7 $\sim$ meV的理论值的分析仪能量分辨率的平面晶体光学。此外,新的光谱仪允许有效的偏振分析,而不会损失能量分辨率。利用金刚石中的纵向声学和光学声子以及Sr $_3$ Ir $_2$ O $_7$中的磁振子演示了仪器的性能。因此,新型的低于10 $\sim$ meV的RIXS光谱仪提供了一个窗口,以小能量尺度的磁性材料。

英文摘要:

Continued improvement of the energy resolution of resonant inelastic x-ray scattering (RIXS) spectrometers is crucial for fulfilling the potential of this technique in the study of electron dynamics in materials of fundamental and technological importance. In particular, RIXS is the only alternative tool to inelastic neutron scattering capable of providing fully momentum resolved information on dynamic spin structures of magnetic materials, but is limited to systems whose magnetic excitation energy scales are comparable to the energy resolution. The state-of-the-art spherical diced crystal analyzer optics provides energy resolution as good as 25 meV but has already reached its theoretical limit. Here, we demonstrate a novel sub-10meV RIXS spectrometer based on flat-crystal optics at the Ir-L$_3$ absorption edge (11.215$\sim$ keV) that achieves an analyzer energy resolution of 3.9$\sim$meV, very close to the theoretical value of 3.7$\sim$meV. In addition, the new spectrometer allows efficient polarization analysis without loss of energy resolution. The performance of the instrument is demonstrated using longitudinal acoustical and optical phonons in diamond, and magnon in Sr$_3$Ir$_2$O$_7$. The novel sub-10$\sim$meV RIXS spectrometer thus provides a window into magnetic materials with small energy scales.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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