Issue |
Europhys. Lett.
Volume 51, Number 4, August II 2000
|
|
---|---|---|
Page(s) | 447 - 453 | |
Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
DOI | https://doi.org/10.1209/epl/i2000-00514-3 | |
Published online | 01 September 2002 |
Anisotropic dynamical scaling in a weakly 3D system: The case of oxygen ordering in
1
Condensed Matter Physics and Chemistry Department, Risø
National Laboratory DK-4000 Roskilde, Denmark
2
HASYLAB - Notkestraße 85, D-22603, Germany
3
Materials Research Department, RisøNational Laboratory
DK-4000 Roskilde, Denmark
4
Forschungszentrum Karlsruhe, ITP - D-76021, Germany
Corresponding author: kall@fy.chalmers.se.
Received:
6
January
2000
Accepted:
9
June
2000
The coarsening of anisotropic oxygen superstructure domains of the Ortho-II type in YBa2Cu3O6.5 has been investigated by high-energy X-ray and neutron diffraction. The time dependence of the scattering function was probed after quenches through the Ortho-II phase transition, and by room temperature measurements of after various sample annealing histories. The data are well accounted for by a Lorentzian-squared–type scattering function. In agreement with the scaling hypothesis, we find that the integrated intensity is independent of time, and the domain growth is described by a single scalar function that characterise the time evolution of the anisotropic correlation lengths. We have thus for the first time demonstrated the applicability of the dynamical scaling hypothesis in a real system of high complexity and intermediate dimensionality.
PACS: 75.40.Gb – Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.) / 83.20.Hn – Structural and phase changes / 74.72.-h – High-Tc compounds
© EDP Sciences, 2000
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