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arXiv 0705.4637cond-mat.str-el
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含激子激发的非共振非弹性X射线散射

Non-resonant inelastic x-ray scattering involving excitonic excitations

M. W. Haverkort, A. Tanaka, L. H. Tjeng, G. A. Sawatzky

摘要:

在最近的出版物中,Larson \textit{et al.}报道了用远低于过渡金属$K$边缘的X射线能量测量的NiO和CoO的非常清楚的$d$ - $d$激发。在这封信中,我们证明,我们可以获得一个准确的定量描述的基础上,当地的多体方法。我们发现,$\vec{q}$的大小可以调整为最大灵敏度的偶极,四极等。激发。我们还发现,$\vec{q}$相对于晶轴的方向可以用作类似于电子能量损失谱的极化的等价物,允许基于选择规则确定初始和最终状态的局部对称性。该方法具有更广泛的适用性,并结合高分辨率,可以成为研究过渡金属化合物中局部畸变和对称性的有力工具,包括掩埋界面。

英文摘要:

In a recent publication Larson \textit{et al.} reported remarkably clear $d$-$d$ excitations for NiO and CoO measured with x-ray energies well below the transition metal $K$ edge. In this letter we demonstrate that we can obtain an accurate quantitative description based on a local many body approach. We find that the magnitude of $\vec{q}$ can be tuned for maximum sensitivity for dipole, quadrupole, etc. excitations. We also find that the direction of $\vec{q}$ with respect to the crystal axes can be used as an equivalent to polarization similar to electron energy loss spectroscopy, allowing for a determination of the local symmetry of the initial and final state based on selection rules. This method is more generally applicable and combined with the high resolution available, could be a powerful tool for the study of local distortions and symmetries in transition metal compounds including also buried interfaces.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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