Photoemission Study of Rh_<17>S_<15> Superconductor
Photoemission Study of Rh_<17>S_<15> Superconductor
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Rh_<17>S_<15>超导体的光电子研究
DOI：
10.1143/jpsjs.80sa.sa111
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
他
中科院分区：
文献类型：
--
作者：
M.Fukui;R.Yoshida;他
利用软X射线光电子能谱和第一性原理能带计算研究了Rh_（17）S_（15）的电子结构. S2 p芯能级谱可用对称分量解释，而Rh 3d芯能级谱则呈现非对称线形，表明在费米能级附近的态上Rh 4d特征占主导地位. Rh_（17）S_（15）中Rh_（4）的结合能与Rh金属中的结合能相似，这一观察结果暗示了金属Rh-Rh成键。计算合理地描述了实验价谱中的许多特征，表明单粒子近似是理解Rh 17 S 15电子性质的一个很好的起点。计算结果与实验结果的比较表明，Rh_（17）S_（15）中费米能级附近态的Rh_（4d）特性是关联超导电性的本质。然而，实验和计算之间的一些偏差，以及有限的质量增强被发现，表明一些修正的处理电子-声子耦合和/或电子关联是必要的。
We have investigated the electronic structures of Rh17S15by using soft x-ray photoemission spectroscopy and first principle band structure calculations. While S 2pcore level spectra are explained by symmetric components, Rh 3dcore level exhibits asymmetric line shape, suggesting a dominant Rh 4dcharacter at the states near the Fermi level. The binding energy of Rh 4din Rh17S15is similar to the one in Rh metal, and this observation implies metallic Rh–Rh bonding. Many features in experimental valence spectra are reasonably described by the calculations, indicating that one particle approximation is a good starting point to understand the electronic properties of Rh17S15. The comparison between the experiment and the calculation suggests that Rh 4dcharacter at the states near the Fermi level is essential for the correlated superconductivity in Rh17S15. However, some deviation between the experiment and the calculation as well as a finite mass enhancement are found, indicating some corrections on the treatment of electron–phonon coupling and/or electron correlations are necessary.