Volume 65, Number 1, January 2004
|Page(s)||137 - 143|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 December 2003|
Aging, rejuvenation and memory due to domain-wall contributions in single crystals
Fachbereich Physik, Martin-Luther-Universität Halle F.-Bach-Platz 6, D-06108 Halle, Germany
2 Institute for Condensed Matter Physics - vul. Sventsits'kogo 1, 79005, L'viv, Ukraine
Accepted: 28 October 2003
Isothermal aging is studied for crystals which were slowly cooled below the ferroelectric phase-transition temperature . Aging is strong within the temperature range of high dielectric domain-wall contributions, but less pronounced below the domain-freezing temperature . Aging and thermal rejuvenation, setting in if cooling is renewed, are discussed in terms of reconformations of collectively pinned domain walls. Dielectric anomalies, detected upon subsequent reheating in the vicinity of the previous dwelling temperatures, are ascribed to a spatial modulation of the defect structure, carrying memory of the domain-wall roughness established during aging.
PACS: 77.22.Gm – Dielectric loss and relaxation / 77.80.Dj – Domain structure; hysteresis / 77.84.Fa – KDP- and TGS-type crystals
© EDP Sciences, 2004
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