Evolution of the spectral weight in the Mott-Hubbard seriesSrVO3-CaVO3-LaVO3-YVO3
Evolution of the spectral weight in the Mott-Hubbard seriesSrVO3-CaVO3-LaVO3-YVO3
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Mott-Hubbard 系列SrVO3-CaVO3-LaVO3-YVO3 中光谱权重的演变
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
F. Vicentin
中科院分区：
文献类型：
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作者：
R. Mossanek;M. Abbate;T. Yoshida;A. Fujimori;Y. Yoshida;N. Shirakawa;H. Eisaki;S. Kohno;F. Vicentin
We studied the Mott-Hubbard series ${ ext{SrVO}}_{3}{ ext{-CaVO}}_{3}{ ext{-LaVO}}_{3}{ ext{-YVO}}_{3}$ with high-energy photoemission. The features in the experimental spectra were interpreted using cluster model calculations. The valence-band photoemission results show very interesting trends across the Mott-Hubbard series: (i) From ${ ext{SrVO}}_{3}$ to ${ ext{CaVO}}_{3}$, the spectral weight is transferred from the coherent to the incoherent feature. (ii) From ${ ext{CaVO}}_{3}$ to ${ ext{LaVO}}_{3}$, the coherent structure disappears, opening the insulating band gap. (iii) Finally, from ${ ext{LaVO}}_{3}$ to ${ ext{YVO}}_{3}$, the bandwidth of the remaining incoherent feature further decreases. There is also a considerable $ ext{V} ext{ }3d$ spectral weight contribution mixed in the $ ext{O} ext{ }2p$ band region in all cases. These results suggest that the $ ext{O} ext{ }2p$ states play an important role in the Mott-Hubbard transition. Some of the changes in the spectra are unexpected and cannot be explained by the current Mott-Hubbard theories. The calculation reproduces not only the coherent and incoherent structures in the $ ext{V} ext{ }3d$ band but also the main features in the $ ext{O} ext{ }2p$ band. In addition, the same model explains the charge-transfer satellites observed in the $ ext{V} ext{ }2p$ core-level spectra.
We studied the Mott-Hubbard series ${ ext{SrVO}}_{3}{ ext{-CaVO}}_{3}{ ext{-LaVO}}_{3}{ ext{-YVO}}_{3}$ with high-energy photoemission. The features in the experimental spectra were interpreted using cluster model calculations. The valence-band photoemission results show very interesting trends across the Mott-Hubbard series: (i) From ${ ext{SrVO}}_{3}$ to ${ ext{CaVO}}_{3}$, the spectral weight is transferred from the coherent to the incoherent feature. (ii) From ${ ext{CaVO}}_{3}$ to ${ ext{LaVO}}_{3}$, the coherent structure disappears, opening the insulating band gap. (iii) Finally, from ${ ext{LaVO}}_{3}$ to ${ ext{YVO}}_{3}$, the bandwidth of the remaining incoherent feature further decreases. There is also a considerable $ ext{V} ext{ }3d$ spectral weight contribution mixed in the $ ext{O} ext{ }2p$ band region in all cases. These results suggest that the $ ext{O} ext{ }2p$ states play an important role in the Mott-Hubbard transition. Some of the changes in the spectra are unexpected and cannot be explained by the current Mott-Hubbard theories. The calculation reproduces not only the coherent and incoherent structures in the $ ext{V} ext{ }3d$ band but also the main features in the $ ext{O} ext{ }2p$ band. In addition, the same model explains the charge-transfer satellites observed in the $ ext{V} ext{ }2p$ core-level spectra.