Temperature Dependence of the Linewidth of the First-Order Raman Spectra for CaWO₄ Crystal

Abstract

The first-order Raman spectra of A_g(1), A_g(2)+B_g(2) and B_g(1) modes in CaWO₄ crystal were measured in the temperature range of 77--771, K and the linewidths at these temperatures were obtained. The temperature dependence of the linewidths was analyzed using the phonon dispersion curves calculated on the basis of a rigid-ion model, and the results showed that it was caused approximately by the cubic anharmonic term in the crystal potential energy.