| Issue |
Europhys. Lett.
Volume 62, Number 4, May 2003
|
|
|---|---|---|
| Page(s) | 512 - 518 | |
| Section | Condensed matter: structure, mechanical and thermal properties | |
| DOI | https://doi.org/10.1209/epl/i2003-00381-x | |
| Published online | 01 May 2003 | |
Ultralow-frequency elastic response in
x
1
Institut für Experimentalphysik, Universität Wien
Strudlhofgasse 4, A-1090 Wien, Austria
2
Institute of Computer Science, Faculty of Electrical
Engineering Technical University of Czestochowa -
Al. Armii Krajowej 17 42-200, Czestochowa, Poland
3
Department of Earth Sciences, University of Cambridge
Downing Street, Cambridge CB3 2EQ, UK
Received:
23
August
2002
Accepted:
7
March
2003
We present novel low-frequency (0.1
–50) measurements of
the complex elastic susceptibility of
x
(x=0, 0.003, 0.018). An ultraslow relaxational process in pure
just below 
is discovered and explained by a
refined heat diffusion model. In addition, a giant softening
(superelasticity) due to domain wall motion is found. In contrast
to the case of 
and also of pure , we
find a ferroelastic domain freezing in the mixed crystals with
0.3% substitution. The dispersion displays a
Cole-Davidson–like behaviour with an additional logarithmic
low-frequency contribution in agreement with the theoretical
results for weak pinning of elastic interfaces in crystals with
randomly distributed impurities.
PACS: 62.20.-x – Mechanical properties of solids / 65.40.-b – Thermal properties of crystalline solids / 62.40.+i – Anelasticity, internal friction, stress relaxation, and mechanical resonances
© EDP Sciences, 2003
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