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- W1520694530 startingPage "6872" @default.
- W1520694530 abstract "The dielectric functions and optical conductivities of Cr${mathrm{O}}_{2}$, Mo${mathrm{O}}_{2}$, and W${mathrm{O}}_{2}$ have been obtained from reflectivity measurements, and the results are interpreted on the basis of qualitative models proposed for the band structures of the transition-metal dioxide series. Cr${mathrm{O}}_{2}$ has been studied as a function of temperature above and below its ferromagnetic transition at ${T}_{c}=392ifmmode^circelsetextdegreefi{}$K. Three conductivity peaks are observed to shift substantially near ${T}_{c}$, and a band near 0.8 eV in the ferromagnetic phase is assigned to transitions between exchange-split Cr $d$ bands. An increase in $3d$ bandwidth and $2pensuremath{-}3d$ separation is observed in the sequence Cr${mathrm{O}}_{2}$, V${mathrm{O}}_{2}$, Mo${mathrm{O}}_{2}$, and W${mathrm{O}}_{2}$, and these effects are correlated with an increasing cation radius. No evidence is found for greatly differing bandwidths for $3d$ orbitals of different symmetries, as has been proposed on empirical grounds." @default.
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- W1520694530 date "1978-12-15" @default.
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- W1520694530 title "Optical properties of Cr<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>, Mo<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>, and W<mml:math …" @default.
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- W1520694530 doi "https://doi.org/10.1103/physrevb.18.6872" @default.
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