Correlated domain dynamics in relaxor ferroelectrics and random-field systems
- 1 July 1998
- journal article
- research article
- Published by Taylor & Francis in Phase Transitions
- Vol. 65 (1-4) , 141-157
- https://doi.org/10.1080/01411599808209285
Abstract
The dielectric response of the relaxor ferroelectrics PbMg1/3Nb2/3O3 and Sr0.998Ca0.002TiO3 is measured via the complex permittivity, ε(ω), and the relaxation of the field-cooled polarization in zero-field, P(t), respectively. Its polydispersivity is attributed to dynamically correlated domains with percolation size distribution. They are induced by spatial fluctuations of intrinsic quenched random-fields. Whereas activated dynamics prevails above T c, non-activated domain wall dynamics occurs below T c. This contrasts with the activated random-bond controlled ordering kinetics of field-induced domains in the diluted two-dimensional Ising antiferromagnet Rb2Co0.85Mg0.15F4.Keywords
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