Low-energy excitations in the rattling Kondo compound CeBa7Au6Si40

The intermetallic type-I clathrate CeBa7Au6Si40 exhibits unusual properties, in particular a strongly enhanced thermopower compared to its Ce-free counterpart. This has been attributed to the compound’s Kondo temperature being boosted by the thermal population of “rattling” phonon modes. Here we intend to scrutinize this picture using temperature dependent RIXS at the Ce M5 edge

金属间化合物I型笼形结构CeBa7Au6Si40展现出反常物性，相较于其不含铈的对应化合物，其热电势（thermopower）尤为显著增强。该现象被归因于该化合物的近藤温度（Kondo temperature）因“晃动”声子模式的热布居而升高。本文拟通过铈M5吸收边的温度分辨共振非弹性X射线散射（Resonant Inelastic X-ray Scattering，RIXS），对这一物理图像展开细致探究。