Abstract
The magnetic properties of nonstoichiometric lanthanum manganites La1–x Mn1–y O3 have been studied in the temperature range 80 K < T < 650 K. The Curie temperature T C changes nonmonotonically as the number of Mn4+ ions increases. In the paramagnetic region, there exist isolated Mn ions and magnetic polarons which can be conserved to T ⩽ 4T C, independent of the lattice symmetry. In the T C < T < T pol region, the temperature dependences of the magnetic susceptibility are nonlinear and can be described by the Curie law with a temperature-dependent Curie constant C. The sample has been prepared having a composition near the O′ → O structural transition; the spontaneous magnetization of the sample at T ⩽ 1.6T C is associated to correlated polarons forming due to the double exchange in chains of the E-type antiferromagnetic phase.
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Original Russian Text © T.I. Arbuzova, S.V. Naumov, 2016, published in Fizika Tverdogo Tela, 2016, Vol. 58, No. 6, pp. 1080–1085.
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Arbuzova, T.I., Naumov, S.V. Nonuniform paramagnetic state in nonstoichiometric lanthanum manganites La1–x Mn1–y O3 . Phys. Solid State 58, 1115–1120 (2016). https://doi.org/10.1134/S1063783416060044
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DOI: https://doi.org/10.1134/S1063783416060044