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Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2004

GIXD measurement of the relaxations and elastic step interactions on Cu(211) and Cu(322)

Geoffroy Prévot
A. Coati
Y. Garreau
  • Fonction : Auteur

Résumé

We have studied by grazing incidence x-ray diffraction the atomic positions near the surface of Cu(211) and Cu(322). For Cu(211), the relaxations are confined to the first atoms, and show a contraction of the step edge. For Cu(322), they extend deeper in the bulk. In that case, by comparing the experimental results with molecular dynamics simulation of the relaxations, we are able to extract precisely the value of the elastic dipoles equivalent to the steps that cause the long range atomic relaxations. The elastic dipole has a stretch component of 2.8×10–10 N/at and a torque component of 3.6×10–10 N/at. It is related to the surface stress of the (111) terraces, that is deduced to be of the order of 2 Nm–1. Using the elasticity theory and by comparison with theoretical results, we are able to derive the elastic interaction between steps. It is found one order of magnitude higher than the value of the step interaction that has been in the past extracted from terrace width distributions.
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Dates et versions

hal-00004697 , version 1 (14-04-2005)

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Citer

Geoffroy Prévot, A. Coati, Y. Garreau. GIXD measurement of the relaxations and elastic step interactions on Cu(211) and Cu(322). Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2004, 70, pp.205406. ⟨10.1103/PhysRevB.70.205406⟩. ⟨hal-00004697⟩
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