Title

Self-organization of Ge tetramers on Ag(001) surface: A 2D realization of unusual substrate mediated interactions

Authors

Authors

H. Oughaddou; B. Aufray; J. P. Biberian; B. Ealet; G. Le Lay; G. Treglia; A. Kara;T. S. Rahman

Comments

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Abbreviated Journal Title

Surf. Sci.

Keywords

ising models; construction and use of effective interatomic; interactions; scanning tunneling microscopy; diffusion and migration; surface structure; morphology; roughness; and topography; surface; thermodynamics; self-assembly; germanium; ALLOY SURFACES; DISSOLUTION KINETICS; SEGREGATION; RECONSTRUCTION; GERMANIUM; LEED; Chemistry, Physical; Physics, Condensed Matter

Abstract

Scanning tunneling microscopy (STM) images recorded during dissolution of a half-monolayer Ge on a Ag(0 0 1) show that it proceeds by the disappearance of tetramer entities. Moreover, they reveal that the successive slowing down in the kinetics, observed during this dissolution, correspond to the formation of ordered 2D arrangements of tetramer vacancies. A lattice gas analysis of the latter predicts a very unusual sequence of pair interactions between these vacancies, probably mediated by the substrate. (C) 2007 Elsevier B.V. All rights reserved.

Journal Title

Surface Science

Volume

602

Issue/Number

2

Publication Date

1-1-2008

Document Type

Article

Language

English

First Page

506

Last Page

510

WOS Identifier

WOS:000253277900017

ISSN

0039-6028

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