Schamper, Christian; Moritz, Wolfgang; Schulz, H.; Feidenhans'l, Robert; Nielsen, Morten; Grey, F.; Johnson, Robert L.
Static lattice distortions and the structure of Au/Si(111)-(5×1): An x-ray-diffraction study.
In: Physical Review B, Vol. 43, Nr. 14: S. 12130-12133
Grazing-incidence x-ray diffraction has been used to determine the atomic arrangement in the 5×1 structure of Au on Si(111). The main features of this structure are partially occupied rows of gold atoms in low-symmetry sites. The density of Au atoms is highly asymmetric in the direction perpendicular to the rows. The substrate atoms in the top double layer are shifted up to 1 Å from their bulk position. The structure has a disordered 5×2 periodicity due to the variation of the interatomic Au-Au distances within a row in the [011¯] direction. The model is consistent with recent scanning-tunneling-microscopy topographs.