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Low-temperature structural phase transition in a monoclinic KDy(WO4)2 crystal

  • Lattice Dynamics. Phase Transitions
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Abstract

The low-temperature thermal and magnetic-resonance properties of a monoclinic KDy(WO4)2 single crystal are investigated. It is established that a structural phase transition takes place at T c=6.38 K. The field dependence of the critical temperature is determined for a magnetic field oriented along the crystallographic a and c axes. The initial part of the H-T phase diagram is plotted for H∥a. The prominent features of the structural phase transition are typical of a second-order Jahn-Teller transition, which is not accompanied by any change in the symmetry of the crystal lattice in the low-temperature phase. The behavior of C(T) in a magnetic field shows that the transition goes to an antiferrodistortion phase. An anomalous increase in the relaxation time (by almost an order of magnitude) following a thermal pulse is observed at T>T c(H), owing to the structural instability of the lattice. A theoretical model is proposed for the structural phase transition in a magnetic field, and the magnetic-field dependence of T c is investigated for various directions of the field.

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Authors and Affiliations

  1. Donetsk Physicotechnical Institute, National Academy of Sciences of Ukraine, 340114, Donetsk, Ukraine

    V. P. D’yakonov, V. I. Markovich, V. L. Kovarskii & A. V. Markovich

  2. Institute of Physics, Polish Academy of Sciences, 02-668, Warsaw, Poland

    M. Borowiec, A. Jedrzejczak & H. Szymczak

Authors
  1. V. P. D’yakonov
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  2. V. I. Markovich
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  3. V. L. Kovarskii
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  4. A. V. Markovich
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  5. M. Borowiec
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  6. A. Jedrzejczak
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  7. H. Szymczak
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Additional information

Fiz. Tverd. Tela (St. Petersburg) 40, 750–758 (April 1998)

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D’yakonov, V.P., Markovich, V.I., Kovarskii, V.L. et al. Low-temperature structural phase transition in a monoclinic KDy(WO4)2 crystal. Phys. Solid State 40, 691–698 (1998). https://doi.org/10.1134/1.1130382

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  • DOI: https://doi.org/10.1134/1.1130382

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