Interface-Confined Mixing and Buried Partial Dislocations for Ag Bilayer on Pt(111)

K. Aït-Mansour, H. Brune, D. Passerone, M. Schmid, W. Xiao, P. Ruffieux, A. Buchsbaum, P. Varga, R. Fasel, O. Gröning

Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland
Institute of Condensed Matter Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland
Institut für Angewandte Physik, Technische Universität Wien, 1040 Wien, Austria
Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

Phys. Rev. B 86 (2012) 085404

The trigonal strain-relief pattern formed by an Ag bilayer on Pt(111) is a prominent example for dislocation networks and their use as nanotemplates. However, its atomic structure has not been solved. Combining scanning tunneling microscopy, low-energy ion scattering, and X-ray photoelectron diffraction, we demonstrate that, unexpectedly, about 22% of the atoms exchange across the Ag/Pt interface, and that the partial dislocations defining the trigonal network are buried in the Pt interface layer. We present an embedded-atom-method simulation identifying the lowest energy structure compatible with all experimental findings.

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Corresponding author: Kamel Aït-Mansour. Reprints also available from M. Schmid (schmid< encoded email address >).