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

抄録

The effects of uniaxial stress σ_yy 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_i1 (β to 1q INC phase), T_i3 (1q to 3q INC phase) and T_c (3q to α phase). Only at T_i1, is the central peak found to have a dynamical component.