Annotation
Results of an experimental study of the special features of the electroacoustic effect in a strontium titanate single crystal in the region of a structural phase transition at $T\approx103$ К are presented. The propagation speed of longitudinal ultrasonic waves at a frequency 30 MHz as a function of the external electric field E is measured. As the temperature decreases and approaches $T\approx103$ K, the functional dependence of the sound speed on the electric field strength is observed to gradually change from quadratic to linear. The emergence of a linear contribution to the transition region is related to the defect-induced deviation of the lattice symmetry from the cubic one.
© 2016 Publisher M.V.Lomonosov Moscow State University
Authors
A.I. Korobov, Yu.A. Brazhkin, N.I. Odina
Department of Acoustics, Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
Department of Acoustics, Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia