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 language||English (US)|
|Number of pages||4|
|Journal||Physical review letters|
|State||Published - 1992|
ASJC Scopus subject areas
- Physics and Astronomy(all)