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    題名: X-ray absorption spectroscopy investigation of the electronic structure of superconducting FeSex single crystals
    作者: 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.
    貢獻者: 淡江大學物理學系
    日期: 2011-02
    上傳時間: 2011-09-30 22:03:04 (UTC+8)
    出版者: Les Ulis: E D P Sciences
    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).
    關聯: Europhysics Letters 93(4), 47003(5pages)
    DOI: 10.1209/0295-5075/93/47003
    顯示於類別:[物理學系暨研究所] 期刊論文


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