Abstract
Using the Raman technique, we have observed large abrupt reversible changes in the phonon spectrum at the transition temperature, T c = 147°C, of the superionic conductor AgI. The defect nature of the high temperature phase completely breaks down the selection rules and allows the Raman measurements to give a measure of the frequency dependent conductivity, σ( ω), assuming a frequency independent matrix element. Similarities as well as differences in σ( ω) above and below T c are shown.
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