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Ferroelectrics Volume 363, 2008 - Issue 1
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Original Articles

Surface Phonons and Soft Bulk Modes in LiCsSO4 Crystals Studied by the High Resolution Brillouin Scattering

A. Trzaskowska Institute of Physics, Adam Mickiewicz University, Umultowska 85, 61-614, Poznan, Poland
,
S. Mielcarek Institute of Physics, Adam Mickiewicz University, Umultowska 85, 61-614, Poznan, Poland
,
B. Mroz Institute of Physics, Adam Mickiewicz University, Umultowska 85, 61-614, Poznan, Poland
&
T. Andrews Department of Physics and Oceanography, Memorial University of Newfoundland, St John's, Newfoundland, A1B 3X7, Canada
Pages 168-176 | Received 05 Jun 2007, Published online: 20 Sep 2010
 
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Abstract

Lattice disturbances caused by a soft bulk mode can be treated as displacement of entire lattice planes. The displacement is also visible on the surface of the crystal and can be detected from the behaviour of the surface phonons. In the crystals of lithium-caesium sulphate some anomalies in the behaviour of certain surface phonons have been detected by the surface Brillouin scattering. A model of the interactions of the soft bulk modes with the surface modes has been proposed to predict which surface phonons can reveal anomalies in the phase transition region.

Acknowledgment

This work has been partially supported by the grant Nr 1 P03B 066 30 from the Ministry of Science and Higher Education.

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