Behaviour of surface phonons in LiCsSO4 crystal at phase transition by A. Trzaskowska, S. Mielcarek, and B. Mroz

Crystal Research and Technology

Cryst. Res. Technol. 40, 449 (2005) - Abstract -

Behaviour of surface phonons in LiCsSO₄ crystal at phase transition

A. Trzaskowska, S. Mielcarek, and B. Mroz

Faculty of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznañ, Poland

Keywords	surface Brillouin scattering, surface phonons, ferroelastic
PACS	62.20. Dc, 68.35. Rh, 68.35 Iv, 78.35.+c
DOI	10.1002/crat.200410365

The paper reports results of Brillouin spectroscopy study performed on surface phonons in different crystallographic surfaces of crystals, in a wide temperature range but with particular emphasis on the temperatures covering the phase transition. The main aim of the study is to establish in which way the ferroelastic phase transition related to a strong soft bulk mode is reflected in the near-surface region of the ferroelastic crystals. Results of the Brillouin scattering of the surface phonons propagating in the ferroelastic crystal LiCsSO₄ in the temperature range covering its phase transition are presented. Surface acoustic phonons in different planes and at various depths from the surface have been studied.

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