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Effect of Uniaxial Stress on Central Peaks in the 1q and 3q Incommensurate Phase of Quartz

The effects of uniaxial stress σ y y on the incommensurate (INC) phase transition of quartz have been investigated by light scattering spectroscopy. The 1q INC phase is induced between β and the 3q INC phase and its region becomes wider with the increase of stress. Anomalies of the central peak in the Rayleigh-Brillouin spectra are observed at three temperatures, corresponding to T i 1 (β to 1q INC phase), T i 3 (1q to 3q INC phase) and T c (3q to α phase). Only at T i 1 , is the central peak found to have a dynamical component.