Volume 62, Number 4, May 2003
|Page(s)||512 - 518|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 May 2003|
Ultralow-frequency elastic response in x
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
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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