Characteristic features of the magnetic ordering of Dy3+ ions in a monoclinic RbDy(WO4)2 single crystal |
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Authors: | V P D’yakonov V I Markovich V L Kovarskii A V Markovich M Borowiec A Jendrzejczak H Szymczak |
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Institution: | (1) Donetsk Physicotechnical Institute, Ukrainian Academy of Sciences, 340114 Donetsk, Ukraine;(2) Institute of Physics, Polish Academy of Sciences, 02-668 Warsaw, Poland |
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Abstract: | The investigation of the specific heat of a RbDy(WO4)2 single crystal at temperatures 0.2–2.5 K and in magnetic fields up to 2 T are reported. The temperature dependence of the
specific heat near T
N=0.818 K is compared with the predictions for different models. The 2D Ising model describes satisfactorily C(T) below T
N, while for T>T
N none of the theoretical models agree with the behavior of C(T) of RbDy(WO4)2. The H-T phase diagram for H∥c is complicated and possesses a triple point, where regions of existence of three magnetic phases converge. The magnetic ordering
is analyzed from the standpoint of the Jahn-Teller nature of the structural phase transitions occurring in RbDy(WO4)2 at higher temperatures. It is shown that the form of the phase diagram depends on the direction of the vector H, for the general case of an arbitrary direction of H, two phase transitions can occur with increasing field.
Fiz. Tverd. Tela (St. Petersburg) 41, 491–496 (March 1999) |
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