Abstract
The dispersion of the real, ε1(ω), and imaginary, ε2(ω), parts of the complex permittivity of Ca1 − x LaxMnO3 single crystals (x = 0, 0.05, 0.10, 0.12, 0.20) was studied at room temperature in the spectral region extending from 60 meV to 5 eV. It was found that substitution of lanthanum for calcium shifts the 3.1-eV absorption band in the optical-conductivity spectrum toward higher energies, with the spectral weight of the low-energy wing of the 2.2-eV band becoming redistributed to the band-gap region (E < 1.5 eV) of the starting CaMnO3 compound. The specific features of optical-conductivity dispersion in the mid-IR region that occur under n-type doping were established. The frequency dependence of optical conductivity was shown to differ from the Drude behavior characteristic of metals. The optical-conductivity spectra of Ca1 − x LaxMnO3 were compared with our earlier results on a series of hole-doped La1 − x SrxMnO3 single crystal.
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Original Russian Text © L.V. Nomerovannaya, A.A. Makhnev, A.M. Balbashov, 2006, published in Fizika Tverdogo Tela, 2006, Vol. 48, No. 2, pp. 291–296.
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Nomerovannaya, L.V., Makhnev, A.A. & Balbashov, A.M. Ellipsometric study of the optical properties of Ca1 − x La x MnO3 single crystals (x = 0–0.2) under n-type doping. Phys. Solid State 48, 308–313 (2006). https://doi.org/10.1134/S1063783406020193
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DOI: https://doi.org/10.1134/S1063783406020193