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- W11526311 abstract "The electronic structure of ${mathrm{La}}_{1mathrm{ensuremath{-}}mathit{x}}$${mathrm{Sr}}_{mathit{x}}$${mathrm{MnO}}_{3}$ has been studied by photoemission and O 1s x-ray-absorption spectroscopy. Spectra of the Mn 2p core levels and the valence bands for ${mathrm{LaMnO}}_{3}$ and ${mathrm{SrMnO}}_{3}$ have been analyzed using a configuration-interaction cluster model. The ground state of ${mathrm{LaMnO}}_{3}$ is found to be mixed ${mathit{d}}^{4}$ and ${mathit{d}}^{5}$L states and that of ${mathrm{SrMnO}}_{3}$ to be heavily mixed ${mathit{d}}^{3}$ and ${mathit{d}}^{4}$L states, reflecting their strong covalency. The character of the band gap of ${mathrm{LaMnO}}_{3}$ is of the p-to-d charge-transfer type while that of ${mathrm{SrMnO}}_{3}$ has considerable p-p character as well as p-d character. Holes doped into ${mathrm{LaMnO}}_{3}$ mainly of oxygen p character are coupled antiferromagnetically with the ${mathit{d}}^{4}$ local moments of the ${mathrm{Mn}}^{3+}$ ions and become itinerant, thus aligning the Mn moments ferromagnetically. The changes in the electronic structure with carrier doping are not of the rigid band type: By La substitution for ${mathrm{SrMnO}}_{3}$, the so-called in-gap spectral weight (of ${mathit{e}}_{mathit{g}mathrm{ensuremath{uparrow}}}$ symmetry) appears with its peak located 1--2 eV below the Fermi level and grows in intensity with increasing La concentration, while the spectral intensity of the ${mathit{e}}_{mathit{g}mathrm{ensuremath{uparrow}}}$ states above the Fermi level decreases, showing a transfer of spectral weight from the unoccupied to the occupied ${mathit{e}}_{mathit{g}mathrm{ensuremath{uparrow}}}$ states with electron doping. Meanwhile, the intensity at the Fermi level remains low even in the metallic phase (0.2ensuremath{lesssim}xensuremath{lesssim}0.6). The energy shifts of core-level peaks and valence-band features with x suggest a downward shift of the Fermi level with hole doping, but the shift is found to be very small in the metallic phase. The importance of the orbital degeneracy of the ${mathit{e}}_{mathit{g}mathrm{ensuremath{uparrow}}}$ band and possible orbital fluctuations in the ferromagnetic phase are pointed out." @default.
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- W11526311 date "1995-05-15" @default.
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- W11526311 title "Electronic structure of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>La</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mi mathvariant=normal>−</mml:mi><mml:mi mathvariant=italic>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Sr</mml:mi></mml:mrow><mml:mrow><mml:…" @default.
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- W11526311 doi "https://doi.org/10.1103/physrevb.51.13942" @default.
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