Sound behavior near the Lifshitz point in proper ferroelectrics

被引：34

作者：

Kohutych, A. ^{[1
]}

Yevych, R. ^{[1
]}

Perechinskii, S. ^{[1
]}

Samulionis, V. ^{[2
]}

Banys, J. ^{[2
]}

Vysochanskii, Yu. ^{[1
]}

机构：

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

[2] Vilnius State Univ, Fac Phys, LT-10222 Vilnius, Lithuania

来源：

PHYSICAL REVIEW B | 2010年 / 82卷 / 05期

关键词：

ULTRASONIC-ATTENUATION; PHASE-TRANSITIONS; UNIAXIAL FERROELECTRICS; NEUTRON-SCATTERING; SINGLE-CRYSTALS; SN2P2S6; ABSORPTION; INSTABILITY; SOLIDS; MODE;

D O I：

10.1103/PhysRevB.82.054101

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The interaction between soft optic and acoustic phonons was investigated for Sn2P2(Se0.28S0.72)(6) proper uniaxial ferroelectrics by Brillouin-scattering and ultrasonic pulse-echo techniques. The elastic softening of hypersound velocity of transverse-acoustic phonons and for both longitudinal and transverse ultrasound waves which propagate near direction of the modulation wave vector (in the incommensurate phase at x > x(LP)) was found at cooling to the Lifshitz point in the paraelectric phase. The strong increase in the ultrasound attenuation has also been observed. Such phenomena are related to the linear interaction of the soft optic and acoustic branches in the region of relatively short-range hypersound waves and to the strongly developed long-range order-parameter fluctuations in the ultrasound frequency range. The hypersound velocity temperature dependence was described within the Landau-Khalatnikov approximation for the ferroelectric phase.

引用

页数：10

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