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

Abstract : 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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Contributor : Noëlle Gohier Connect in order to contact the contributor
Submitted on : Thursday, April 14, 2005 - 10:48:14 AM
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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), American Physical Society, 2004, 70, pp.205406. ⟨10.1103/PhysRevB.70.205406⟩. ⟨hal-00004697⟩



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