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Thermal expansion anomalies in TbVO4 due to the cooperative Jahn-Teller effect

  • Magnetism and Ferroelectricity
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Abstract

The thermal expansion anomalies in TbVO4 due to the cooperative Jahn-Teller effect were studied experimentally and theoretically. Characteristic magnetoelastic anomalies were observed in the curves of Δa/a and Δc/c of the cell parameters at T<T c. Calculations of the magnetoelastic contribution to Δa/a and Δc/c from fully symmetric \(\varepsilon ^{\alpha _1 } \) and \(\varepsilon ^{\alpha _2 } \) and low-symmetry ɛδ modes were performed using the general crystal-field formalism, and the values of the magnetoelastic coefficient B δ were obtained from spectroscopic and spontaneous-deformation data. It is shown that the thermal expansion of TbVO4 in both the tetragonal and orthorhombic phases can be described well on the basis of a general model based on a single set of interaction parameters.

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Authors and Affiliations

  1. M. V. Lomonosov Moscow State University, 119899, Moscow, Russia

    Z. A. Kazei

  2. Bryansk State Technical University, 241035, Bryansk, Russia

    N. P. Kolmakova, A. A. Sidorenko & L. V. Takunov

Authors
  1. Z. A. Kazei
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  2. N. P. Kolmakova
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  3. A. A. Sidorenko
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  4. L. V. Takunov
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Additional information

Fiz. Tverd. Tela (St. Petersburg) 40, 1663–1666 (September 1998)

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Kazei, Z.A., Kolmakova, N.P., Sidorenko, A.A. et al. Thermal expansion anomalies in TbVO4 due to the cooperative Jahn-Teller effect. Phys. Solid State 40, 1513–1515 (1998). https://doi.org/10.1134/1.1130588

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  • DOI: https://doi.org/10.1134/1.1130588

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