Atomic-scale structure of dislocations revealed by scanning tunneling microscopy and molecular dynamics

Jesper Christiansen, K. Morgenstern, Jakob Schiøtz, Karsten Wedel Jacobsen, K.F. Braun, K.H. Rieder, E. Laegsgaard, Flemming Besenbacher

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Abstract

The intersection between dislocations and a Ag(111) surface has been studied using an interplay of scanning tunneling microscopy (STM) and molecular dynamics. Whereas the STM provides atomically resolved information about the surface structure and Burgers vectors of the dislocations, the simulations can be used to determine dislocation structure and orientation in the near-surface region. In a similar way, the subsurface structure of other extended defects can be studied. The simulations show dislocations to reorient the partials in the surface region leading to an increased splitting width at the surface, in agreement with the STM observations. Implications for surface-induced cross slip are discussed.
Original languageEnglish
JournalPhysical Review Letters
Volume88
Issue number20
Pages (from-to)206106
Number of pages4
ISSN0031-9007
DOIs
Publication statusPublished - 2002

Bibliographical note

Copyright (2002) American Physical Society

Keywords

  • METAL-SURFACES
  • DISSOCIATION
  • AG(111)

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