FREQUENCY AND TEMPERATURE-DEPENDENCE OF THE THERMOPOLARIZATION RESPONSE IN DYNAMIC INVESTIGATIONS

The frequency and temperature dependence of the thermopolarization (TP ) response both in low and high frequency regimes are experimentally s tudied for the first time. These experiments are performed using the p araelectric phase of the ferroelectrics PbNi1/3Nb2/3O3 and PbMg1/3Nb2/ 3O3 as examples. In the high frequency regime the magnitude of the dyn amic TP response is proportional to omega(-1/2) and practically indepe ndent on sample thickness and temperature. In the low frequency regime the dynamic TP response is proportional to omega(1/2), inversely prop ortional to the sample thickness, and its temperature behavior follows that of the bulk susceptibility. These experimental results support p revious theoretical inferences.