MICROSCOPIC THEORY OF THE ELECTROACOUSTIC ECHO IN ORDER-DISORDER ANTIFERROELECTRICS

A microscopic theory of the electro-acoustic echo (EAE) is proposed fo r the case in which two pulses of a variable electric field act on an antiferroelectric. This theory augments the phenomenological theory pr oposed for the purpose of interpreting experiments on the main regular ities of the electro-acoustic echo in order-disorder antiferroelectric s. The deuterization effect and ''pre-polarization'' effect are explai ned. The shape of the echo signal is derived analytically and it is sh own that this shape depends on the time interval between pump pulses. (C) 1998 American Institute of Physics.