| Issue |
Europhys. Lett.
Volume 33, Number 5, February II 1996
|
|
|---|---|---|
| Page(s) | 391 - 396 | |
| Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
| DOI | https://doi.org/10.1209/epl/i1996-00352-3 | |
| Published online | 01 September 2002 | |
Non-ergodic aging and hierarchical organization in lithium-potassium tantalate crystals
Laboratoire
d'Acoustique et Optique de la Matière Condensée , Université P.
et M. Curie,
Case 78, 75252 Paris Cedex 05, France
Received:
22
March
1995
Accepted:
3
January
1996
The dielectric constant of 
, with x = 0.01 and x =
0.025, and specially its value at very long times, measured
as a function of time (aging) at 4 K, depends on the
cooling rate; this is a non-ergodic behaviour which manifests
the lack of self-similarity of the phase space. The response to
temperature jumps, similar to that of spin-glasses, is the
signature of hierarchical organization of the phase space.
For x = 0 (pure 
), the behaviour is ergodic.
PACS: 77.22.Gm – Dielectric loss and relaxation / 78.30.Ly – Disordered solids
© EDP Sciences, 1996
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