Effect of a Rare-Earth Ion on the Structural Instability in RFe3(BO3)4 Crystals

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作者：
M. S. Pavlovskiy
V. I. Zinenko
A. S. Shinkorenko
机构：
[1] Russian Academy of Sciences,Kirensky Institute of Physics, Federal Research Center KSC, Siberian Branch
来源：
JETP Letters | 2018年 / 108卷
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摘要：
The dynamics of the crystal lattice of RFe3(BO3)4 (R = Pr, Nd, Sm, Gd, Tb, Dy, and Ho) compounds in the high-symmetry R32 phase has been calculated. Significant changes in spectra of compounds with various rare-earth ions have been obtained only near the edge Λ point of the Brillouin zone (qΛ = 1/3(−2b1 + b2 + b3, where b1, b2, and b3 are the reciprocal lattice vectors) for acoustic oscillation branches. A decrease in the frequency of an acoustic mode at the point Λ has been revealed in all studied compounds. This frequency depends on the type of rare-earth ion and decreases from a compound with Pr to a compound with Ho down to imaginary values. Such a behavior of the frequency of the unstable acoustic mode is in good agreement with experimental data on the dependence of the temperature of the R32 → P3121 structural phase transition on the type of rare-earth ion in ferroborates.
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页码：116 / 120
页数：4
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