Abstract
The magnetic, electronic, and polarization properties of the SrFeO3 and SrMnO3 compounds with a perovskite structure are calculated using the density functional theory in the bulk and thin-film states. A ferroelectric instability is found to be absent in the bulk state, and the polar mode is softened in the thin-film state of SrMnO3 in the presence of tensile stresses in the substrate. As a result, a polar phase with a polarization of 23 μC/cm2 appears, which agrees with experimental data. The study of the magnetic and electronic properties demonstrates the existence of G-type antiferromagnetic ordering in SrMnO3 and the appearance of a dielectric gap of about 1.5 eV in its thin film. A ferromagnetic phase with metallic conduction in both the bulk and thin-film states is detected in SrFeO3.
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Original Russian Text © A.V. Nemtsev, V.S. Zhandun, V.I. Zinenko, 2018, published in Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2018, Vol. 153, No. 4, pp. 597–606.
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Nemtsev, A.V., Zhandun, V.S. & Zinenko, V.I. Ab Initio Study of the Polarization, Electronic, Magnetic, and Optical Properties of Perovskite SrMO3 (M = Fe, Mn) Crystals and Thin Films Containing Magnetic Ions. J. Exp. Theor. Phys. 126, 497–505 (2018). https://doi.org/10.1134/S1063776118030056
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DOI: https://doi.org/10.1134/S1063776118030056