An Investigation of the Dynamical Properties of Crystals by Raman Spectroscopy.

摘要

This report describes light scattering measurements from a variety of materials which undergo structural phase transitions. The materials studied include boracites, lead germanate and perovskites and the studies have found new transitions, determined the nature of the soft mode and detailed the changes in the spectra due to the presence or addition of impurities. In addition associated theoretical work has questioned the validity of the usual way of interpreting soft mode results obtained from light scattering techniques. An experiment was also performed to study the light scattering from magnons in a mixed antiferromagnet. (Author)