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• W1508864954 abstract "Valence-band photoemission spectra have been measured from cleaved stoichiometric iron oxide single crystals using synchrotron radiation. The total photoelectron yield is observed to increase dramatically at photon energies above the Fe 3pensuremath{rightarrow}3d excitation threshold, and the resonant onset correlates directly with the oxidation state of the Fe cations. Features in the total yield profiles are interpreted in terms of atomic multiplets. The phenomenon of resonant photoemission is used to distinguish the Fe 3d-derived valence states from the overlapping unhybridized O 2p states in each of the oxides. By use of cleaved single crystals, the subtle differences in the valence-band photoemission features associated with ferrous (${mathrm{Fe}}^{2+}$) and ferric (${mathrm{Fe}}^{3+}$) cations have been determined. The measured energy distribution of the photoemission final states in single crystal ensuremath{alpha}-${mathrm{Fe}}_{2}$${mathrm{O}}_{3}$ are in good agreement with recent measurements and configuration-interaction cluster calculations by Fujimori et al., which take into account ligand-to-metal charge transfer. Constant-initial-state spectra measured across the 3pensuremath{rightarrow}3d threshold in each oxide indicate that most of the photoemission intensity near the top of the valence band is derived from hybridized cation-3d--ligand-2p states, whereas the emission at higher binding energies results from primarily 3${d}^{nmathrm{ensuremath{-}}1}$ final states. On this basis, each of the iron oxides is classified as a charge-transfer rather than a Mott-Hubbard insulator." @default.
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• W1508864954 date "1989-06-15" @default.
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• W1508864954 title "Photoemission study of the valence-band electronic structure in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Fe</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant=normal>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>O,<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Fe</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></…" @default.
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• W1508864954 doi "https://doi.org/10.1103/physrevb.39.13478" @default.
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