| Issue |
Europhys. Lett.
Volume 46, Number 3, May I 1999
|
|
|---|---|---|
| Page(s) | 351 - 356 | |
| Section | Condensed matter: structure, mechanical and thermal properties | |
| DOI | https://doi.org/10.1209/epl/i1999-00268-x | |
| Published online | 01 September 2002 | |
A new low-temperature state in a La-modified lead zirconate titanate relaxor
1
Laboratoire de Physique de la Matière Condensée,
Université de Picardie Jules Verne 33 rue Saint-Leu, 80039, Amiens,
France
2
Institute for Materials Sciences, NASC of Ukraine Krjijanovskogo
Str., 3, 252180, Kiev, Ukraine
3
Institute of Physics of Semiconductors, NASC of Ukraine prosp.
Nauki, 45, 252650, Kiev, Ukraine
Received:
12
November
1998
Accepted:
19
February
1999
Several anomalies are observed in the relaxor system
at low temperature for the first time: a boson
peak in the Raman scattering at frequencies below 
, and
extrema in the dielectric permittivity and pyroelectric current near 45 K.
Calculations show that these anomalies are connected with a
polarization-deformation coupling via electrostriction. Due to this
coupling, the new low-temperature glassy state is called an "improper
dipole glass”. The generality of the proposed model suggests that
similar states should also exist in other disordered ferroelectrics.
PACS: 63.50.+x – Vibrational states in disordered systems / 77.84.Dy – Niobates, titanates, tantalates, PZT ceramics, etc
© EDP Sciences, 1999
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