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Magnetostructural phase transitions in NiO and MnO: Neutron diffraction data

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Abstract

Structural and magnetic phase transitions in NiO and MnO antiferromagnets have been studied by high-precision neutron diffraction. The experiments have been performed on a high-resolution Fourier diffractometer (pulsed reactor IBR-2), which has the record resolution for the interplanar distance and a high intensity in the region of large interplanar distances; as a result, the characteristics of both transitions have been determined simultaneously. It has been shown that the structural and magnetic transitions in MnO occur synchronously and their temperatures coincide within the experimental errors: T str ≈ T mag ≈ (119 ± 1) K. The measurements for NiO have been performed with powders with different average sizes of crystallites (~1500 nm and ~138 nm). It has been found that the transition temperatures differ by ~50 K: T str = (471 ± 3) K, T mag = (523 ± 2) K. It has been argued that a unified mechanism of the “unsplit” magnetic and structural phase transition at a temperature of T mag is implemented in MnO and NiO. Deviation from this scenario in the behavior of NiO is explained by the quantitative difference—a weak coupling between the magnetic and secondary structural order parameters.

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Authors and Affiliations

  1. Joint Institute for Nuclear Research, Dubna, Moscow region, 141980, Russia

    A. M. Balagurov, I. A. Bobrikov, S. V. Sumnikov & V. Yu. Yushankhai

  2. Institute of Solid State Physics, University of Latvia, LV-1063, Riga, Latvia

    N. Mironova-Ulmane

Authors
  1. A. M. Balagurov
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  2. I. A. Bobrikov
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  3. S. V. Sumnikov
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  4. V. Yu. Yushankhai
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  5. N. Mironova-Ulmane
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Correspondence to A. M. Balagurov.

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Original Russian Text © A.M. Balagurov, I.A. Bobrikov, S.V. Sumnikov, V.Yu. Yushankhai, N. Mironova-Ulmane, 2016, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2016, Vol. 104, No. 2, pp. 84–90.

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Balagurov, A.M., Bobrikov, I.A., Sumnikov, S.V. et al. Magnetostructural phase transitions in NiO and MnO: Neutron diffraction data. Jetp Lett. 104, 88–93 (2016). https://doi.org/10.1134/S0021364016140071

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  • DOI: https://doi.org/10.1134/S0021364016140071

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