Acoustic attenuation in ferroelectric Sn2P2S6 crystals

• Authors: Anton Kohutych , Ruslan Yevych , Sergij Perechinskii , Yulian Vysochanskii
• Languages of publication: EN

Abstracts

EN

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.

Keywords

EN

Brillouin scattering; ferroelectric phase transition; Gruneisen coefficient

• Publisher: De Gruyter Open
• Journal: Open Physics
• Year: 2010
• Volume: 8
• Issue: 6
• Pages: 905-914

Dates

published

1 - 12 - 2010

online

5 - 9 - 2010

Contributors

author

Anton Kohutych

• Institute for Physics and Chemistry of Solid State, Uzhgorod National University, Pidgirna Str. 46, Uzhgorod, 88000, Ukraine

author

Ruslan Yevych

• Institute for Physics and Chemistry of Solid State, Uzhgorod National University, Pidgirna Str. 46, Uzhgorod, 88000, Ukraine

author

Sergij Perechinskii

• Institute for Physics and Chemistry of Solid State, Uzhgorod National University, Pidgirna Str. 46, Uzhgorod, 88000, Ukraine

author

Yulian Vysochanskii

• Institute for Physics and Chemistry of Solid State, Uzhgorod National University, Pidgirna Str. 46, Uzhgorod, 88000, Ukraine

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Identifiers

DOI

10.2478/s11534-010-0016-x