Anomalies in the Raman scattering spectra of piezoelectric BaZnF<sub>4</sub> crystals
H N Bordallo; A Bulou; R Almairac; J Nouet; H N Bordallo; Groupe de Dynamique des Phase Condensees, Univ. des Sci. et Tech. du Languedoc, Montpellier, France; A Bulou; Groupe de Dynamique des Phase Condensees, Univ. des Sci. et Tech. du Languedoc, Montpellier, France; R Almairac; Groupe de Dynamique des Phase Condensees, Univ. des Sci. et Tech. du Languedoc, Montpellier, France; J Nouet; Groupe de Dynamique des Phase Condensees, Univ. des Sci. et Tech. du Languedoc, Montpellier, France
Журнал:
Journal of Physics: Condensed Matter
Дата:
1994-11-21
Аннотация:
A Raman scattering investigation of the piezoelectric compound BaZnF<sub>4</sub> has been performed in a wide temperature range. An accurate study of the characteristics, i.e. peak shifts, integrated intensities and half-widths, reveals anomalous changes in several spectral lines. The results are discussed on the basis of a breakdown of the q=0 selection rules due to either a phase transition or structural disorder.
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