Abstract
Perovskites of composition La1−x Srx(Mn1−x/2Nb x/2)O3 and La0.49Sr0.51(Mn1−y Nby)O3 have been synthesized and investigated. The substitution of nonmagnetic niobium ions for manganese was shown to lead to a transition from the metallic into the insulating state due to a decrease in the number of dissimilar (different-valence) manganese atoms in the lattice. In spite of the high resistivity, the niobium-containing perovskites exhibit a large magnetoresistive effect and ferromagnetic ordering. Small additions of Nb5+ to La0.49Sr0.51MnO3 stimulate the transition from the antiferromagnetic into the ferromagnetic state, whereas the substitution of Mg2+ for Mn stabilizes the antiferromagnetic state. It is supposed that the ferromagnetism in the insulating perovskites at hand is due to the positive superexchange of the Mn3+-O-Mn3+ type, and the magnetoresistive effect owes to the intergranular transfer of spin-polarized charge carriers and the suppression of magnetic nonuniformities by an applied magnetic field near T C.
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Translated from Fizika Tverdogo Tela, Vol. 42, No. 1, 2000, pp. 81–85.
Original Russian Text Copyright © 2000 by Troyanchuk, Efimov, Khalyavin, Pushkarev, Shimchak.
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Troyanchuk, I.O., Efimov, D.A., Khalyavin, D.D. et al. Magnetic ordering and magnetoresistive effect in La1−x Srx(Mn1−y Mey)O3 perovskites (Me = Nb, Mg). Phys. Solid State 42, 84–88 (2000). https://doi.org/10.1134/1.1131172
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DOI: https://doi.org/10.1134/1.1131172