The possibility of a frequency-independent or frequency-dependent damping constant, γ, is experimentally investigated, using the right-angle Raman results for the heavily damped soft-E mode in the ferroelectric PbTiO₃ at 491^∘{}C (just below the transition temperature). The fits, over a wide frequency range, using a frequency-independent γ are so good that there is little room for any appreciable frequency dependence. This is in disagreement with several claims made in a recent paper by Heiman, Ushioda, and Remeika.
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Gerald Burns (1976) studied this question.
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