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Defects and the structure of a manganite La0.85Sr0.15MnO3 crystal

  • Magnetism and Ferroelectricity
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Abstract

Defects in a ferromagnetic crystal of manganite La0.85Sr0.15MnO3 were created by irradiation with fast neutrons (E > 0.1 MeV). Fast neutrons produce defect clusters in a crystal lattice. The volume fraction of the clusters in the crystal after irradiation to a dose F = 2 × 1019 cm−2 (T irr = 340 K) was ≅40%. The structural and magnetic states of the modified manganite were studied using thermal-neutron diffraction and magnetic measurements. It was revealed that neutron irradiation of a crystal suppresses the cooperative Jahn-Teller effect and the initial charge modes and decreases the temperature of ferromagnetic ordering. Under irradiation with fast neutrons, the crystalline structure of the manganite changes from the orthorhombic O′ to the pseudocubic O* phase. Arguments are advanced in favor of the specific features of the irradiated-manganite structural state being determined by long-wavelength strains induced in the crystal by antisite defects.

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Authors and Affiliations

  1. Institute of Metal Physics, Ural Division, Russian Academy of Sciences, ul. S. Kovalevskoĭ 18, Yekaterinburg, 620219, Russia

    S. F. Dubinin, Yu. G. Chukalkin, S. G. Teploukhov, V. E. Arkhipov & V. D. Parkhomenko

  2. Moscow Institute of Steel and Alloys, Leninskiĭ pr. 4, Moscow, 117936, Russia

    Ya. M. Mukovskiĭ

Authors
  1. S. F. Dubinin
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  2. Yu. G. Chukalkin
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  3. S. G. Teploukhov
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  4. V. E. Arkhipov
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  5. V. D. Parkhomenko
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  6. Ya. M. Mukovskiĭ
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Original Russian Text © S.F. Dubinin, Yu.G. Chukalkin, S.G. Teploukhov, V.E. Arkhipov, V.D. Parkhomenko, Ya.M. Mukovskiĭ, 2006, published in Fizika Tverdogo Tela, 2006, Vol. 48, No. 10, pp. 1805–1811.

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Dubinin, S.F., Chukalkin, Y.G., Teploukhov, S.G. et al. Defects and the structure of a manganite La0.85Sr0.15MnO3 crystal. Phys. Solid State 48, 1917–1923 (2006). https://doi.org/10.1134/S1063783406100179

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  • DOI: https://doi.org/10.1134/S1063783406100179

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