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Magnetic ordering in La1−x SrxMnO3−x/2 anion-deficient manganites

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Abstract

The structural, magnetic, and electrotransport properties of La1−x SrxMnO3− x/2(0≤x≤0.30) manganites with perovskite structure are investigated experimentally as a function of oxygen deficiency. In the solid solutions La1−x SrxMnO3, a change in the type of symmetry of the unit cell is observed at x=0.125. Samples with x≤0.125 are characterized by an O′-orthorhombic unit cell, whereas samples with x>0.125 are characterized by a rhombohedral unit cell. The structural properties of the anion-deficient solid solutions La1−x SrxMnO3−x/2 are analogous to those of the stoichiometric system. It is assumed that, as the oxygen content decreases, La1− x SrxMnO3−x/2 anion-deficient solid solutions experience a series of successive magnetic phase transformations in the ground state: from an A-type (x=0) antiferromagnet to a cluster spin-glass-type inhomogeneous magnetic state (0.175>x≤0.30) through a two-phase (antiferromagnetic and ferromagnetic) state (0>x≤0.175). The anion-deficient solid solution with x=0.175 has the maximal value of the ferromagnetic component. As the oxygen deficiency increases, the resistivity of La1− x SrxMnO3−x/2 samples first decreases (up to a value of x=0.175), acquiring an activation character, and then increases (up to a value of x=0.30). In this case, none of the anion-deficient solid solutions exhibits a metal-semiconductor transition in the whole range of concentrations considered. A peak of magnetoresistance at a temperature below the point of magnetic ordering is observed only in the sample with x=0.175. The results of experiments carried out with a series of La1−x SrxMnO3−x/2 anion-deficient solid solutions are summarized in the concentration diagrams of the spontaneous magnetic moment and the critical temperature of magnetic phase transitions. Hypothetical magnetic phase states are pointed out. The experimental results obtained can be interpreted in terms of the phase-separation model and the competition between ferromagnetic and antiferromagnetic indirect superex-change interactions. It is assumed that Mn3+-O-Mn3+ indirect superexchange interactions in the orbitally disordered phase are positive in the case of octahedral coordination of manganese ions and are negative when the coordination of at least one Mn3+ ion is pentahedral.

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Authors and Affiliations

  1. Institute of Solid-State and Semiconductor Physics, National Academy of Sciences of Belarus, Minsk, 220072, Belarus

    S. V. Trukhanov, M. V. Bushinsky & I. O. Troyanchuk

  2. Institute of Physics, Polish Academy of Sciences, Warsaw, 02-668, Poland

    H. Szymczak

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  1. S. V. Trukhanov
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  2. M. V. Bushinsky
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  3. I. O. Troyanchuk
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  4. H. Szymczak
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__________

Translated from Zhurnal Éksperimental’no\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) i Teoretichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Fiziki, Vol. 126, No. 4, 2004, pp. 874–886.

Original Russian Text Copyright © 2004 by Trukhanov, Bushinsky, Troyanchuk, Szymczak.

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Trukhanov, S.V., Bushinsky, M.V., Troyanchuk, I.O. et al. Magnetic ordering in La1−x SrxMnO3−x/2 anion-deficient manganites. J. Exp. Theor. Phys. 99, 756–765 (2004). https://doi.org/10.1134/1.1826167

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