X-ray absorption spectroscopy investigation of the electronic structure of superconducting FeSex single crystals
學年 99
學期 2
出版（發表）日期 2011-02-01
作品名稱 X-ray absorption spectroscopy investigation of the electronic structure of superconducting FeSex single crystals
作品名稱（其他語言）
著者 Chen, C. L.; Rao, S. M.; Dong, C. L.; Chen, J. L.; Huang, T. W.; Mok, B. H.; Ling, M. C.; Wang, W. C.; Chang, C. L.; Chan, T. S.; Lee, J. F.; Guo, J. H.; Wu, M. K.
單位 淡江大學物理學系
出版者 Les Ulis: E D P Sciences
著錄名稱、卷期、頁數 Europhysics Letters 93(4), 47003(5pages)
摘要 X-ray absorption spectroscopy (XAS) Fe K-edge spectra of the FeSex (x=1–0.8) single crystals cleaved in situ under vacuum reveal characteristic Fe 4sp states and a lattice distortion. The Se K-edge spectra point to a strong Fe 3d-Se 4p hybridization giving rise to itinerant charge carriers. A formal charge of ~1.8+ for Fe and ~2.2− for Se was evaluated from these spectra in the FeSex (x=0.88). The charge balance between Fe and Se is assigned to itinerant electrons located in the Fe-Se hybridization bond. As x decreases the 4p hole count increases and a crystal structure distortion is observed that in turn causes the Fe separation in the ab-plane change from 4p orbital to varying (modulating) coordination. Powder X-ray diffraction (XRD) measurements also show a slight increase in lattice parameters as x decreases (increasing Se deficiency).
關鍵字
語言 en
ISSN 0295-5075 1286-4854
期刊性質 國外
收錄於 SCI
產學合作
通訊作者 Chen, C. L.; Rao, S. M.
審稿制度
國別 FRA
公開徵稿
出版型式 紙本 電子版
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