Random-field model of
Department of Physics, Shandong University - Jinan, 250100, PRC
2 Laboratorium für Angewandte Physik, Gerhard Mercator Universität Duisburg D-47048 Duisburg, Germany
Accepted: 23 November 2000
The mechanism of the dielectric response in is explained according to the transverse-field Ising model. The impurity-polarized cluster induces the appearance of ferroelectric domain states. The random field leads to the diffusion of the dielectric response. Our model is in good agreement with the experimental result.
PACS: 77.22.Ej – Polarization and depolarization / 77.80.Bh – Phase transitions and Curie point
© EDP Sciences, 2001