Electronic structure and evolution of the orbital state in metallic Ca2-xSrxRuO4
Electronic structure and evolution of the orbital state in metallic Ca2-xSrxRuO4
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DOI：
10.1103/physrevb.72.052411
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发表时间：
2005-08
影响因子：
3.7
通讯作者：
H. Noh;Shinyoung Oh;Byeong-Gyu Park;Jae-Hoon Park;Jae-Sun Kim;Heejung Kim;T. Mizokawa;L. Tjeng;Hong‐ji Lin;C. Chen;S. Schuppler;S. Nakatsuji;H. Fukazawa;Y. Maeno
中科院分区：
文献类型：
--
作者：
H. Noh;Shinyoung Oh;Byeong-Gyu Park;Jae-Hoon Park;Jae-Sun Kim;Heejung Kim;T. Mizokawa;L. Tjeng;Hong‐ji Lin;C. Chen;S. Schuppler;S. Nakatsuji;H. Fukazawa;Y. Maeno
我们使用偏振相关的 O $1s$ X 射线研究了金属状态 $(0.15\ensuremath{\leqslant}x\ensuremath{\leqslant}2.0)$ 中层状 ${\mathrm{Ca}}_{2\ensuremath{-}x}{\mathrm{Sr}}_{x}\mathrm{Ru}{\mathrm{O}}_{4}$ 的电子结构吸收光谱。光谱显示出强烈的偏振变化，特别是在 Ru $4d$ 区域，这使我们能够识别电子态。谱线形状随着Sr浓度的增加而逐渐变化，与无限制的Hartree-Fock分析非常吻合，这表明轨道态的演化，并为晶格畸变如何影响轨道占据提供了线索。
We investigated the electronic structure of a layered ${\mathrm{Ca}}_{2\ensuremath{-}x}{\mathrm{Sr}}_{x}\mathrm{Ru}{\mathrm{O}}_{4}$ in a metallic regime $(0.15\ensuremath{\leqslant}x\ensuremath{\leqslant}2.0)$ using a polarization dependent O $1s$ x-ray absorption spectroscopy. The spectrum shows strong variations with the polarization especially in Ru $4d$ region, which enables us to identify the electronic states. The spectral line shape gradually changes with increase of Sr concentration, and agrees well with an unrestricted Hartree-Fock analysis, which suggests evolution of the orbital states and provides clues for how the lattice distortion affects the orbital occupations.