Abstract

Dispersion relations of low-frequency phonon polaritons in the crystals, which undergo structural phase transitions, give important information about the mechanisms of the transitions. In this work, low-frequency polaritons have been measured by the combination of the double monochromator with concave holographic gratings and the optical system designed for this purpose. The results of measurements are given for the crystals BNN, Sr2Nb2O7 and GMO.

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