Ring clusters in transition-metalsilicon surface structures

P. A. Bennett, M. Copel, David G Cahill, J. Falta, R. M. Tromp

Research output: Contribution to journalArticlepeer-review


We have determined the atomic structure of the Si(111)-(√7 × √7)Co surface using scanning tunneling microscopy and ion scattering. The unit cell contains one surface substitutional cobalt atom centered under a 6 silicon adatom cluster. High-temperature annealing produces a low density lattice gas of these ringlike clusters, giving rise to an "impurity stablized 1 × 1" structure. They occur for several other transition metals, suggesting a stable, universal, silicide related structure.

Original languageEnglish (US)
Pages (from-to)1224-1227
Number of pages4
JournalPhysical review letters
Issue number8
StatePublished - 1992
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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