| Issue |
Europhys. Lett.
Volume 39, Number 3, July I 1997
|
|
|---|---|---|
| Page(s) | 275 - 280 | |
| Section | Condensed matter: structure, thermal and mechanical properties | |
| DOI | https://doi.org/10.1209/epl/i1997-00347-0 | |
| Published online | 01 September 2002 | |
Large amplitudes and (critical) slowing-down of the order parameter fluctuations near the second-order tetragonal-to-orthorhombic phase transformation in YBa2Cu3Ox
Institut für Festkörperphysik, Technische Hochschule Darmstadt,
Hochschulstraße 6, D-64289 Darmstadt, Germany
Received:
3
March
1997
Accepted:
23
June
1997
exhibits a second-order tetragonal-to-orthorhombic transformation, at least
in wide temperature ranges. The order parameter is proportional to the orthorhombic strain or to
the O population difference between 
and 
sites in the
Cu(1) plane. Quasi-static anelasticity experiments were performed at 100 and 
on samples with O concentrations x between 6.29 and 6.9. The
experiments show a drastic increase of both relaxation strength and relaxation time near the
tetragonal-to-orthorhombic transformation at 
, thus demonstrating i) large amplitudes
and ii) a (critical) slowing-down of the order parameter fluctuations.
PACS: 62.40.+i – Anelasticity, internal friction, stress relaxation, and mechanical resonances / 64.70.Kb – Solid-solid transitions / 66.30.-h – Diffusion in solids
© EDP Sciences, 1997
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