Issue |
Europhys. Lett.
Volume 46, Number 3, May I 1999
|
|
---|---|---|
Page(s) | 401 - 406 | |
Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
DOI | https://doi.org/10.1209/epl/i1999-00275-y | |
Published online | 01 September 2002 |
Aging and memory effects in a disordered crystal
1
Laboratoire des Milieux Désordonnés et
Hétérogènes (Associated with the Centre National de la Recherche Scientifique (UMR
7603).)
Université P. et M. Curie - Case 86, 75252 Paris Cedex 05,
France
2
Departamento de Fisica, Universidade do Minho - 4709 Braga, Portugal
Received:
4
December
1998
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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