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- W1998532247 abstract "Near-normal incidence reflectivity measurements have been made on basal planes of single crystals of NaCr${mathrm{S}}_{2}$ and CuCr${mathrm{S}}_{2}$ in the photon energy range 3.7 to 14 eV, at room and liquid-nitrogen temperatures. For the NaCr${mathrm{S}}_{2}$ crystal, at room temperature, the energy range was extended down to 1.5 eV. The similarities and differences between the two spectra have been interpreted using simple physical arguments and molecular-orbital ideas. Band-structure models for NaCr${mathrm{S}}_{2}$ and CuCr${mathrm{S}}_{2}$ have been proposed. A sharp excitoniclike peak at 7.6 eV is observed on the NaCr${mathrm{S}}_{2}$ reflectivity spectrum. It is tentatively suggested that this sharp peak is (most probably) a high-energy exciton caused by a charge transfer transition from the mainly chalcogen $p$-like valence band to a metal-orbital-based (especially the $s$) conduction band. In our band models for these $ensuremath{alpha}$-NaFe${mathrm{O}}_{2}$-type materials, the ${mathrm{Cr}}^{3+}d({t}_{2g}, {e}_{g})$ states are envisaged as discrete levels lying just below the main conduction band." @default.
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- W1998532247 date "1980-10-15" @default.
- W1998532247 modified "2023-09-23" @default.
- W1998532247 title "Vacuum-ultraviolet reflectivity spectra of some<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mi>α</mml:mi></mml:math>-NaFe<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>O</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>layer-type compounds" @default.
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- W1998532247 doi "https://doi.org/10.1103/physrevb.22.4066" @default.
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