Acoustic attenuation in ferroelectric Sn2P2S6 crystals

被引：13

作者：

Kohutych, Anton A. ^{[1
]}

Yevych, Ruslan M. ^{[1
]}

Perechinskii, Sergij I. ^{[1
]}

Vysochanskii, Yulian M. ^{[1
]}

机构：

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

来源：

CENTRAL EUROPEAN JOURNAL OF PHYSICS | 2010年 / 8卷 / 06期

关键词：

Brillouin scattering; ferroelectric phase transition; Gruneisen coefficient; 2ND-ORDER PHASE-TRANSITION; LIFSHITZ POINT; CRITICAL-BEHAVIOR; PHONON INTERACTIONS; NEUTRON-SCATTERING; LITHIUM TANTALATE; SOFT MODES; ABSORPTION; SPECTRA; SOLIDS;

D O I：

10.2478/s11534-010-0016-x

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The temperature and frequency dependencies of sound attenuation for the proper uniaxial ferroelectric Sn2P2S6, which has a strong nonlinear interaction of the polar soft optic and fully symmetrical optic modes that is related to the triple well potential, were studied by Brillouin spectroscopy. It was found that the sound velocity anomaly is described in the Landau-Khalatnikov approximation with one relaxation time. For explanation of the observed temperature and frequency dependencies of the sound attenuation in the ferroelectrric phase, the accounting of several relaxation times is needed and, for quantitative calculations, the mode Gruneisen coefficients are more appropriate as interacting parameters than are the electrostrictive coefficients. Relaxational sound attenuation by domain walls also appears in the ferroelectric phase of Sn2P2S6 crystals.

引用

页码：905 / 914

页数：10

共 45 条

[1]

Akhieser A, 1939, J PHYS-USSR, V1, P277

[2]

Al'-Shufi K., 1993, Physics of the Solid State, V35, P1055

[3]

Ashcroft N., 2011, Solid State Physics

[4] Dielectric properties in the vicinity of phase transition of new ferroelectric CuInP2S6 [J].

Banys, J ;

Samulionis, V ;

Cajipe, V .

FERROELECTRICS, 1999, 223 (1-4) :43-50

[5] ULTRASONIC ATTENUATION BY INTERACTION WITH SOFT OPTIC MODE IN KTAO3 [J].

BARRETT, HH .

PHYSICAL REVIEW, 1969, 178 (02) :743-&

[6] CRITIQUE OF CURRENT THEORIES OF AKHIESER DAMPING IN SOLIDS [J].

BARRETT, HH ;

HOLLAND, MG .

PHYSICAL REVIEW B, 1970, 1 (06) :2538-&

[7] DIFFRACTION ANALYSIS OF INCOMMENSURATE PHASES IN CRYSTALS OF QUASI-BINARY SYSTEM SN2P2(S1-XSEX)6 [J].

BARSAMIAN, TK ;

KHASANOV, SS ;

SHEKHTMAN, VS .

FERROELECTRICS, 1993, 138 (1-4) :63-77

[8] The acoustical Gruneisen constants of solids [J].

Belomestnykh, VN .

TECHNICAL PHYSICS LETTERS, 2004, 30 (02) :91-93

[9]

Bokotei A. A., 1997, Ukrayins'kyi Fizychnyi Zhurnal, V42, P55

[10] CRYSTAL-STRUCTURE OF SN2P2S6 [J].

DITTMAR, G ;

SCHAFER, H .

ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES, 1974, B 29 (5-6) :312-317

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