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- W1622139824 abstract "The ellipsometry measurements (in the energy range $E=0.5--5.0phantom{rule{0.3em}{0ex}}mathrm{eV}$) on cleavage surfaces of single crystals, the measurements of the absorption and reflectance spectra $(E=0.04--0.8phantom{rule{0.3em}{0ex}}mathrm{eV})$, electrical resistivity, and magnetic susceptibility were carried out for determination of peculiarities of the fundamental absorption spectrum and the conductivity mechanism in $mathrm{Ca}mathrm{Mn}{mathrm{O}}_{3ensuremath{-}ensuremath{delta}}$ single crystals. The energy of fundamental absorption edge associated with the direct transitions was determined as ${E}_{mathrm{g}}=1.55phantom{rule{0.3em}{0ex}}mathrm{eV}$. The absorption band with two maxima at 2.2 and $3.1phantom{rule{0.3em}{0ex}}mathrm{eV}$ corresponding to the charge transfer transitions was revealed. The polaron band at $0.7phantom{rule{0.3em}{0ex}}mathrm{eV}$ was discovered and polaron parameters were determined. Peculiarities of IR absorption and dc conductivity of $mathrm{Ca}mathrm{Mn}{mathrm{O}}_{3ensuremath{-}ensuremath{delta}}$ in dependence on oxygen stoichiometry are determined by the superposition of hopping and band conductivity of spin-lattice polarons, and by additional localization of charge carriers under oxygen vacancies ordering." @default.
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- W1622139824 date "2004-12-07" @default.
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- W1622139824 title "Electronic structure and polarons in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mi mathvariant=normal>Ca</mml:mi><mml:mi mathvariant=normal>Mn</mml:mi><mml:msub><mml:mi mathvariant=normal>O</mml:mi><mml:mrow><mml:mn>3</mml:mn><mml:mo>−</mml:mo><mml:mi>δ</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>single crystals: Optical data" @default.
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- W1622139824 doi "https://doi.org/10.1103/physrevb.70.224406" @default.
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