Au 6 × 6 on Si(111): Evidence for a 2D Pseudoglass

L. D. Marks, D. Grozea, R. Feidenhans'l, M. Nielsen and R. L. Johnson
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L. D. Marks: Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208, USA
D. Grozea: Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208, USA
R. Feidenhans'l: Department of Solid State Physics and Chemistry, Risø National Laboratory, DK-4000 Roskilde, Denmark
M. Nielsen: Department of Solid State Physics and Chemistry, Risø National Laboratory, DK-4000 Roskilde, Denmark
R. L. Johnson: II. Institute for Experimental Physics, University of Hamburg, 22761 Hamburg, Germany

Surface Review and Letters (SRL), 1998, vol. 05, issue 02, 459-464

Abstract: The atomic structure of the Au 6 × 6 on Si(111) phase has been determined using direct methods and surface X-ray diffraction data. This surface structure is very complicated, with 14 independent gold atoms, relaxations in 24 independent silicon sites and three partially occupied gold sites. In one sense the structure can be described as microdomains of the parent$\sqrt{3}\times\sqrt{3}~{\rm Au}$on Si(111) structure. A better description is in terms of a tiling of incomplete pentagonal and trimer units, essentially a pseudopentagonal glass. In terms of these structural units it appears possible to explain all the gold structures in the coverage range of 0.8–1.5 monolayers as pseudoglasses with strong short range order but varying degrees of long range order.

Date: 1998
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DOI: 10.1142/S0218625X98000827

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