| Issue |
Europhys. Lett.
Volume 44, Number 6, December II 1998
|
|
|---|---|---|
| Page(s) | 753 - 758 | |
| Section | Condensed matter: structure, thermal and mechanical properties | |
| DOI | https://doi.org/10.1209/epl/i1998-00537-2 | |
| Published online | 01 September 2002 | |
Fluctuation-dominated regime in the second-order antiferrodistortive transition of the layered perovskite 
Laboratoire Physique de l'Etat Condensé, UPRES-A 6087, Université du Maine, Avenue Olivier Messiaen - 72085 Le Mans cedex 9, France
Received:
9
October
1998
Accepted:
27
October
1998
By EPR spectroscopy, the two components (n=2) of the order parameter are monitored
near Tc in the second-order structural phase transition of the layered
compound from P4/mbm to Pmmn. The direction of the spontaneous
displacements is not fixed by symmetry but depends on the ratio between two quartic
anisotropies. In the never before probed range 
, a sharp crossover
is evidenced as well as in 
(
).
The order parameter amplitude accurately follows an exponent law of index
, at most slightly increased in the random-bond–like solid solution.
PACS: 64.60.Fr – Equilibrium properties near critical points, critical exponents / 63.70.+h – Statistical mechanics of lattice vibrations and displacive phase transitions / 76.30.Fc – Iron group (3d) ions and impurities (Ti-Cu)
© EDP Sciences, 1998
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