Abstract
Compound La0.7Sr0.3Mn0.85Nb0.15O3, in which manganese ions are in an oxidation state close to 3+, are studied by neutron diffraction and magnetic measurements. This compound is shown to be a ferromagnet with T C = 145 K and a magnetic moment of 3.1 μB/Mn at T = 10 K. No signs of cooperative orbital ordering are detected. When Mg2+ ions substitute for some Nb5+ ions, Mn4+ ions appear but ferromagnetism is not enhanced. An increase in the structural distortions leads to a decrease in the ferromagnetic component. The ferromagnetic state is assumed to be caused by substantial hybridization of the e g orbitals of manganese and oxygen, which increases the positive part of the superexchange interactions.
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Original Russian Text © I.O. Troyanchuk, M.V. Bushinsky, N.V. Volkov, V. Sikolenko, E.A. Efimova, C. Ritter, 2015, published in Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2015, Vol. 147, No. 1, pp. 112–118.
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Troyanchuk, I.O., Bushinsky, M.V., Volkov, N.V. et al. Role of superexchange interactions in the ferromagnetism of manganites. J. Exp. Theor. Phys. 120, 97–102 (2015). https://doi.org/10.1134/S1063776115010173
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DOI: https://doi.org/10.1134/S1063776115010173