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Local Disorder in Ln2Ti2O7 (Ln = Gd, Tb, Dy) Pyrochlores

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Abstract

The temperature dependences of extended X-ray absorption fine structure (EXAFS) and X-ray absorption near edge structure (XANES) spectra of Ln2Ti2O7 (Ln = Gd, Tb, Dy) geometrically frustrated magnets with a pyrochlore structure are presented. The temperature dependences of the Ln-O and Ti-O interatomic bond lengths and Debye-Waller factors σ2 characterizing the local static and dynamic disordering of bonds have been obtained in the temperature range of 10–300 K. The stiffnesses of metal-oxygen bonds and the parameters of local disordering of the structure have been determined from the dependences σ2(T). The effect of the magnetic state of rare-earth ions on local features of the Ln2Ti2O7 structure has been described. The characteristics of local disorder in pyrochlores under study have been compared to dysprosium zirconate Dy2Zr2O7 having a disordered fluorite structure.

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Authors and Affiliations

  1. National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Moscow, 115409, Russia

    A. P. Menushenkov, V. V. Popov, B. R. Gaynanov, A. A. Ivanov, A. V. Kuznetsov & A. A. Yaroslavtsev

  2. National Research Center Kurchatov Institute, Moscow, 123182, Russia

    V. V. Popov

  3. European X-Ray Free-Electron Laser Facility GmbH, 22869, Schenefeld, Germany

    A. A. Yaroslavtsev

  4. Consiglio Nazionale delle Ricerche-Istituto Officina dei Materiali-Operative Group in Grenoble at European Synchrotron Radiation Facility, Linea Italiana per la Spettroscopia d’Assorbimento Collaborating Research Groups, 38000, Grenoble, France

    F. d’Acapito & A. Puri

Authors
  1. A. P. Menushenkov
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  2. V. V. Popov
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  3. B. R. Gaynanov
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  4. A. A. Ivanov
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  5. A. V. Kuznetsov
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  6. A. A. Yaroslavtsev
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  7. F. d’Acapito
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  8. A. Puri
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Corresponding author

Correspondence to A. P. Menushenkov.

Additional information

Russian Text © The Author(s), 2019, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2019, Vol. 109, No. 8, pp. 540–546.

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Menushenkov, A.P., Popov, V.V., Gaynanov, B.R. et al. Local Disorder in Ln2Ti2O7 (Ln = Gd, Tb, Dy) Pyrochlores. Jetp Lett. 109, 529–535 (2019). https://doi.org/10.1134/S0021364019080095

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  • DOI: https://doi.org/10.1134/S0021364019080095

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