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    题名: X-Ray spectra and electronic correlations of FeSe1-xTex
    作者: Chen, C. L.;Dong, C. L.;Chen, J. L.;Guo, J.-H.;Yang, W. L.;Hsu, C. C.;Yeh, K. W.;Huang, T. W.;Mok, B. H.;Chan, T. S.;Lee, J. F.;Chang, C. L.;Rao, S. M.;Wu, M. K.
    贡献者: 淡江大學物理學系
    日期: 2011
    上传时间: 2013-04-29 11:39:39 (UTC+8)
    出版者: Cambridge: R S C Publications
    摘要: Critical issues concerning emerging Fe-based superconductors include the degree of electron correlation and the origin of the superconductivity. X-Ray absorption spectra (XAS) and resonant inelastic X-ray scattering spectra (RIXS) of FeSe1−xTex (x = 0–1) single crystals were obtained to study their electronic properties that relate to electron correlation and superconductivity. The linewidth of Fe L2,3-edges XAS of FeSe1−xTex is narrower than that of Fe–pnictides, revealing the difference between their hybridization effects and localization character and those of other Fe–pnictides. While no significant differences exist between the Fe L-edge XAS and RIXS of FeSe1−xTex and those of Fe–pnictides, Se K-edge and Te K-edge XAS exhibit substantial edge shift, suggesting that the superconductivity in an Fe–Se superconductor is strongly associated with the ligand states. A comparison of the Se K-edge and Te K-edge spectra reveals that the charge transfer may occur between Se and Te. Given the Coulomb interaction and the bandwidth, the spectral results indicate that FeSe1−xTex is unlikely to be a weakly correlated system unlike the Fe–pnictides of the “1111” and “122” families. The spectral results further demonstrate that superconductivity in this class of Fe-based compounds is strongly associated with the ligand 4p hole state.
    關聯: Physical Chemistry Chemical Physics 13(34), pp.15666-15672
    DOI: 10.1039/C1CP20765B
    显示于类别:[物理學系暨研究所] 期刊論文


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