Aging of the field-induced asymmetry in a disordered ferroelectric

B. Bonello (), P. Doussineau, V. Dupuis and A. Levelut

The European Physical Journal B: Condensed Matter and Complex Systems, 2006, vol. 52, issue 2, 219-225

Abstract: The isothermal aging of the asymmetry induced in the disordered dielectric crystal $\mbox{KTa}_{1-x} \mbox{Nb}_{x} \mbox{O}_{3} $ (x=0.027) submitted to the biasing electric field E, is investigated. To this end, the response of the complex dielectric constant to infinitesimal field changes $\delta{\bf E}$ , applied to the sample after a variable aging delay, has been measured for different magnitudes of E and after different aging delays. Two different experimental procedures have been used: in both cases the response strongly depends on the time spent under field. For short aging delays, the response has a strong contribution proportional to δE and a weak quadratic contribution proportional to $\left({\delta E}\right)^2$ . As time elapses, the linear and the quadratic contributions age in opposite ways: the former decreases whereas the latter increases. This paradoxical behaviour is analyzed in the framework of a model which attributes aging and the related effects (rejuvenation, memory) to the evolution of polarization domain walls: the decrease of the linear contribution is related to the decrease of the total wall area, while the increase of the quadratic term is attributed to wall reconformations. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2006

Keywords: 61.43.-j Disordered solids; 77.22.Gm Dielectric loss and relaxation (search for similar items in EconPapers)
Date: 2006
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DOI: 10.1140/epjb/e2006-00279-5

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