期刊
SURFACE SCIENCE
卷 549, 期 1, 页码 52-66出版社
ELSEVIER
DOI: 10.1016/j.susc.2003.11.020
关键词
X-ray scattering, diffraction, and reflection; surface stress; copper; oxygen; low index single crystal surfaces
We have studied by grazing incidence X-ray diffraction the self-ordering of the Cu-CuO stripe pattern. By comparing the experimental results to molecular dynamics simulations and anisotropic linear elastic calculations, we have been able to determine the atomic relaxations within the Cu substrate. The results show the importance of the crystalline anisotropy in the relaxation field. These relaxations are due to the surface stress difference Deltasigma between oxygen-covered and bare Cu(110) regions. For the different oxygen coverages studied, we have always found Deltasigma = 1.0 +/- 0.1 Nm(-1), This surface stress difference is shown to be the origin of the self-ordering. (C) 2003 Published by Elsevier B.V.
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