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Structure and magnetism of the manganite LaMnO3 with defects

  • Magnetism and Ferroelectricity
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Abstract

The structural and magnetic states of LaMnO3 samples containing various concentrations of antisite defects created by fast-neutron irradiation were studied by neutron diffraction, x-ray diffraction, and magnetic measurements. It is found that the static uncorrelated displacements of oxygen ions induced by the formation of antisite defects break the Jahn-Teller Q 2 mode and the initial orthorhombic O′-type structure transforms into the pseudocubic O * modification. As a result, the indirect ferromagnetic exchange caused by the overlap of the e g orbitals of manganese ions and the p σ orbitals of oxygen ions becomes three-dimensional and the initial A-type antiferromagnetic phase transforms into a canted ferromagnetic phase. The magnetic phase diagram of LaMnO3 is plotted for various defect concentrations.

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Authors and Affiliations

  1. Institute of Metal Physics, Ural Division, Russian Academy of Sciences, ul. S. Kovalevskoĭ 18, Yekaterinburg, 62004, Russia

    Yu. G. Chukalkin & A. E. Teplykh

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  1. Yu. G. Chukalkin
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  2. A. E. Teplykh
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Original Russian Text © Yu.G. Chukalkin, A.E. Teplykh, 2006, published in Fizika Tverdogo Tela, 2006, Vol. 48, No. 12, pp. 2183–2189.

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Chukalkin, Y.G., Teplykh, A.E. Structure and magnetism of the manganite LaMnO3 with defects. Phys. Solid State 48, 2310–2316 (2006). https://doi.org/10.1134/S1063783406120110

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  • DOI: https://doi.org/10.1134/S1063783406120110

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