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Intrinsic charge transfer gap in NiO from Ni K-edge x-ray absorption spectroscopy

机译:Ni K边缘x射线吸收光谱法测定NiO的本征电荷转移间隙

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摘要

Pre-edge features in x-ray absorption spectroscopy contain key information about the lowest excited states and thus on the most interesting physical properties of the system. In transition-metal oxides they are particularly structured but extracting physical parameters by comparison with a calculation is not easy due to several computational challenges. By combining core-hole attraction and correlation effects in a first-principles approach, we calculate Ni K-edge x-ray absorption spectra in NiO. We obtain a striking parameter-free agreement with experimental data and show that dipolar pre-edge features above the correlation gap are due to nonlocal excitations largely unaffected by the core hole. We show that in charge transfer insulators, this property can be used to measure the correlation gap and probe the intrinsic position of the upper Hubbard band.
机译:X射线吸收光谱仪的边缘特征包含有关最低激发态的关键信息,因此也包含有关系统最有趣的物理特性的关键信息。在过渡金属氧化物中,它们具有特殊的结构,但由于计算上的困难,通过与计算的比较提取物理参数并不容易。通过在第一原理方法中结合芯孔吸引和相关效应,我们计算了NiO中的Ni K边缘x射线吸收光谱。我们获得了与实验数据惊人的无参数一致性,并表明相关间隙上方的偶极子前缘特征是由于非局部激发而不受芯孔的影响。我们表明,在电荷转移绝缘子中,此特性可用于测量相关间隙并探查上哈伯德带的固有位置。

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  • 来源
    《Physical review》 |2009年第4期|212-216|共5页
  • 作者单位

    CNRS and Institut de, Mineralogie et de Physique des Milieux Condenses, case 115, 4 place Jussieu, 75252 Paris Cedex 05, France;

    CNRS and Institut de, Mineralogie et de Physique des Milieux Condenses, case 115, 4 place Jussieu, 75252 Paris Cedex 05, France;

    CNRS and Institut de, Mineralogie et de Physique des Milieux Condenses, case 115, 4 place Jussieu, 75252 Paris Cedex 05, France;

    CNRS and Institut de, Mineralogie et de Physique des Milieux Condenses, case 115, 4 place Jussieu, 75252 Paris Cedex 05, France;

    CNRS and Institut de, Mineralogie et de Physique des Milieux Condenses, case 115, 4 place Jussieu, 75252 Paris Cedex 05, France;

    CNRS and Institut de, Mineralogie et de Physique des Milieux Condenses, case 115, 4 place Jussieu, 75252 Paris Cedex 05, France;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    X-ray absorption spectra; X-ray emission spectra and fluorescence;

    机译:X射线吸收光谱;X射线发射光谱和荧光;

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