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VOLUME 39 (1984) | ISSUE 12 | PAGE 545
Anomalous temperature dependence of the damping of the soft mode in an incommensurate phase in the particular cases of Cd2Nb2O7 and Rb2ZnBr4
The anomalously large and slightly temperature-dependent damping of the soft mode in the Raman spectrum in an incommensurate phase suggests the presence of a phason. As T-^Tt~, the temperature dependence of this damping is determined by an amplitudon.