Hypersound Waves Near the Lifshitz Point in Sn2P2(SexS1-x)6 Ferroelectrics

被引：6

作者：

Kohutych, A. A. ^{[1
]}

Yevych, R. M. ^{[1
]}

Perechinskii, S. I. ^{[1
]}

Vysochanskii, Yu. M. ^{[1
]}

机构：

[1] Uzhgorod State Univ, Inst Solid State Phys & Chem, UA-88000 Uzhgorod, Ukraine

来源：

FERROELECTRICS | 2009年 / 379卷

关键词：

Brillouin scattering; dispersion of sound velocity; ferroelectric transitions; Lifshitz point; PHONON INTERACTIONS; NEUTRON-SCATTERING; SOFT MODES; SN2P2S6; CRYSTALS; PHASE;

D O I：

10.1080/00150190902852026

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Anisotropy of hypersound velocities at room temperature in Sn2P2S6 and Sn2P2(Se0.28S0.72)(6) crystals is investigated by Brillouin scattering spectroscopy using different scattering geometries. The dispersion of velocity of the longitudinal sound waves propagating along [001] crystallographic direction is measured. The significant changes of velocity of the transversal sound waves propagating and polarized in (010) symmetry plane were observed in accordance with previously reported experimental data. The existence of Lifshitz point in Sn2P2(Se0.28S0.72)(6) crystals and the contribution of acoustic phonons in soft mixed optic-acoustic modes at the ferroelectric phase transitions may be the reason of such a behaviour of elastic properties of crystals under study.

引用

页码：375 / 380

页数：6

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