Abstract
The reflectance, the optical density, and the optical conductivity spectra of CaMn1 − x Mo x O3 (x ≤ 0.07) polycrystals are studied over a wide spectral region. The substitution of Mo6+ ions for Mn4+ ions leads to a strong decrease in the first high-energy phonon band, which is related to vibrations in the MnO6 octahedron. The appearance of band-type charge carriers is detected in CaMn1 − x Mo x O3 with x ≤ 0.04, and carrier localization is observed in CaMn0.93Mo0.07O3. This localization increases at T < 160 K, i.e., during the transition from the paramagnetic to the antiferromagnetic state with orbital ordering and a monoclinic structure. The optical conductivity spectrum of CaMn0.93Mo0.07O3 exhibits a strong shift of fundamental absorption bands, which is associated with a change in the band structure because of a decrease in the splitting of the 3d levels of Mn in the crystal field.
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Original Russian Text © E.V. Mostovshchikova, S.V. Naumov, A.A. Makhnev, N.I. Solin, S.V. Telegin, 2014, published in Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2014, Vol. 145, No. 2, pp. 340–347.
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Mostovshchikova, E.V., Naumov, S.V., Makhnev, A.A. et al. Evolution of the optical properties and the electrical resistivity of CaMnO3 during the substitution of Mo for Mn ions. J. Exp. Theor. Phys. 118, 297–303 (2014). https://doi.org/10.1134/S1063776114010257
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DOI: https://doi.org/10.1134/S1063776114010257