Unreconstructed Au(100) monolayers on a Au3Pd(100) single-crystal surface

M. Aschoff, S. Speller, J. Kuntze, W. Heiland, E. Platzgummer*, M. Schmid*, P. Varga*, and B. Baretzky+

Fachbereich Physik, Universität Osnabrück, D-49069 Osnabrück, Germany
* Institut für Allgemeine Physik, Technische Universität Wien, A-1040 Wien, Austria
+ MPI für Metallphysik, D-70174 Stuttgart, Germany

Surf. Sci. 415 (1998) L1051-L1054

The Au3Pd(100) single-crystal surface was studied with ion scattering methods, low energy electron diffraction (LEED) and scanning tunneling microscopy. The crystal is covered at room temperature with a pure, (100)-oriented gold layer. Palladium is found in the second layer only. The lattice constant of the gold surface as evaluated by ion scattering and a tensor LEED (TLEED) analysis is equal to the bulk lattice constant of 4.017 Å as evaluated by X-ray analysis. The surface lattice constant of the gold layer on the alloy surface is 0.08 Å smaller than that of bulk gold.

Corresponding author: W. Heiland. Reprints also available from M. Schmid (schmid< encoded email address >).

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