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Effect of strain on surface diffusion and nucleation

Harald Brune, Karsten Bromann, Holger Röder, Klaus Kern, Joachim Jacobsen, Per Stoltze, Karsten Jacobsen, and Jens No/rskov
Phys. Rev. B 52, R14380(R) – Published 15 November 1995
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Abstract

The influence of strain on diffusion and nucleation has been studied by means of scanning tunneling microscopy and effective-medium theory for Ag self-diffusion on strained and unstrained (111) surfaces. Experimentally, the diffusion barrier is observed to be substantially lower on a pseudomorphic Ag monolayer on Pt(111), 60 meV, compared to that on Ag(111), 97 meV. The calculations show that this strong effect is due to the 4.2% compressive strain of the Ag monolayer on Pt. It is shown that in general isotropic two-dimensional strain as well as its relief via dislocations have a drastic effect on surface diffusion and nucleation in heteroepitaxy and are thus of significance for the film morphology in the kinetic growth regime.

  • Received 5 September 1995

DOI:https://doi.org/10.1103/PhysRevB.52.R14380

©1995 American Physical Society

Authors & Affiliations

Harald Brune, Karsten Bromann, Holger Röder, and Klaus Kern

  • Institut de Physique Expérimentale, Ecole Polytechnique Féderalé de Lausanne, CH-1015 Lausanne, Switzerland

Joachim Jacobsen, Per Stoltze, Karsten Jacobsen, and Jens No/rskov

  • Center for Atomic-Scale Materials Physics and Physics Department, Technical University of Denmark, DK-2800 Lyngby, Denmark

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Issue

Vol. 52, Iss. 20 — 15 November 1995

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