Atomic-scale structure of dislocations revealed by STM and Molecular Dynamics
1 Center for Atomic Scale Materials Physics (CAMP) and
Department of Physics, Building 307, Technical University of Denmark,
DK-2800 Lyngby, Denmark
2 Materials Research Department, Risø National
Laboratory, DK-4000 Roskilde, Denmark.
3 Institut für Experimentalphysik, FB Physik, Freie
Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany
4 CAMP and Institute of Physics and Astronomy,
University of Aarhus, DK-8000 Aarhus C, Denmark
Abstract
The intersection between dislocations and a Ag(111) surface has been studied
using an interplay of scanning tunneling microscopy (STM) and molecular
dynamics (MD). 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 sub-surface 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.
Physical Review Letters 88, 206106 (2002).
This paper is available online from the Physical
Review Letters website. A locally stored version is available
here (PDF, 553 kB).
A preprint of the paper is available from the
www.arXiv.org preprint archive as
paper number
cond-mat/0110552.
Last modified: 7 May 2002.
Jakob Schiøtz,
schiotz@fysik.dtu.dk