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Proceedings Paper

Noise and aging studies of relaxor ferroelectrics
Author(s): Michael B. Weissman; Eugene V. Colla; Lambert K. Chao
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Paper Abstract

A combination of noise and aging data on relaxor ferroelectrics shows that this category of glassy system contains materials with diverse physics. Barkhausen noise studies of several cubic relaxor materials indicate that the sizes of dynamically coherent units are limited by competition between driving field energies and barrier heights. At the onset of glassy behavior, the coherent dipole moment changes drop rapidly, indicating rapid increase in barrier heights. Several different cubic relaxors show aging effects similar to spinglasses in the frozen glassy regime. However, the scale of fields needed to disrupt aging is inconsistent with models of spinglass order among ferroelectric nanodomains. We propose a model similar to reentrant xy spinglasses, in which the glass freezing is from polarization components orthogonal to the ferro polarization. A prediction of this model is that uniaxial relaxors should not show spinglass aging in their frozen state, and this prediction is confirmed.

Paper Details

Date Published:
PDF: 11 pages
Proc. SPIE 5469, Fluctuations and Noise in Materials, ; doi: 10.1117/12.545165
Show Author Affiliations
Michael B. Weissman, Univ. of Illinois/Urbana-Champaign (United States)
Eugene V. Colla, Univ. of Illinois/Urbana-Champaign (United States)
Lambert K. Chao, Univ. of Illinois/Urbana-Champaign (United States)

Published in SPIE Proceedings Vol. 5469:
Fluctuations and Noise in Materials
Dragana Popovic; Michael B. Weissman; Zoltan A. Racz, Editor(s)

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