Interlayer diffusion of adatoms: a scanning tunneling microscopy study

E. Lundgren, B. Stanka, G. Leonardelli, M. Schmid, and P. Varga

Institut für Allgemeine Physik, Technische Universität Wien, A-1040 Wien, Austria

Phys. Rev. Lett. 82 (1999) 5068-5071

Low coverages of Co are deposited at room temperature on a Pt(111) surface with vacancy islands providing a high density of steps. Scanning tunneling microscopy images with chemical contrast show that Co atoms do not descend Pt steps by diffusing over the step, but descend from the upper terrace to the lower by an exchange diffusion process with the Pt atoms at the step edge. The Co atoms descend a Pt step edge by this process neither at straight A nor at B-steps, but rather at the corners or kinks of the vacancy islands.

Corresponding author: M. Schmid (schmid< encoded email address >)

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