Low-temperature structural phase transition in a monoclinic KDy(WO4)2 crystal |
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Authors: | V P D’yakonov V I Markovich V L Kovarskii A V Markovich M Borowiec A Jedrzejczak H Szymczak |
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Institution: | (1) Donetsk Physicotechnical Institute, National Academy of Sciences of Ukraine, 340114 Donetsk, Ukraine;(2) Institute of Physics, Polish Academy of Sciences, 02-668 Warsaw, Poland |
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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.
Fiz. Tverd. Tela (St. Petersburg) 40, 750–758 (April 1998) |
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