Abstract
In this work we present a detailed study of the temperature evolution (290 K–20 K) of the polarized Raman spectra in a single crystal of glycinium phosphite. The phase transition manifests itself by the activation of new Raman bands and by the occurrence of anomalies in the temperature dependence of the wavenumber of some external and internal modes. The results show that occurring deformations in molecular units contribute relevantly to the spontaneous polarization in GPI. The anomalous behaviour of the wavenumber and of the damping constant of some bands is in good agreement with a theoretical model based in a pseudospin-phonon interaction.
Acknowledgments
N. J. Muga thanks Fundação para a Ciência e a Tecnologia (FCT) for his grant BICJ/247847/2001. This work was supported by the Project POCTI/CTM/45284/2002 and by Programa FEDER/POCTI/Projecto n°2-155/94-Fundação para a Ciência e a Tecnologia.