Volume 46, Number 3, May I 1999
|Page(s)||401 - 406|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Aging and memory effects in a disordered crystal
Laboratoire des Milieux Désordonnés et
Hétérogènes (Associated with the Centre National de la Recherche Scientifique (UMR
Université P. et M. Curie - Case 86, 75252 Paris Cedex 05,
2 Departamento de Fisica, Universidade do Minho - 4709 Braga, Portugal
Accepted: 15 February 1999
Dielectric constant measurements have been performed in the ferroelectric low-temperature phase of a crystal. It is found that aging at a fixed temperature induces a memory effect: the real part and the imaginary part of the complex dielectric constant ε around remain weaker than they would be without aging, as long as the temperature stays below Tpl; on the contrary, a sojourn of the sample at temperatures higher than Tpl rapidly erases the dips on and . Similarities with recent results obtained on two spin-glasses are emphasized and discussed.
PACS: 77.22.Gm – Dielectric loss and relaxation / 78.30.Ly – Disordered solids
© EDP Sciences, 1999
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