Abstract
Oxygen adsorbed on Cu(100) induces results in phase coalesced nano-sized c(2×2)-O domains with high density of anti-phase domain boundaries when the coverage is lower than ca. 0.3 ML. When the coverage exceeds 0.3 ML, however, large c(2×2)-O domains are formed among the nano-sized c(2×2)-O domains, that is, two nano-sized c(2×2)-O domains are coalesced into one large c(2×2)-O domain by adsorbing oxygen at a boundary. Interestingly, one-by-one release of Cu atoms is brought about on the large c(2×2)-O domain and the (2 2 × 2 ) R45°− O reconstruction is established, where a large c(2×2)-O domain is a transitive phase to the (2 2 × 2 )R45°−O reconstruction. When Cu atoms are deposited on a nano-sized c(2×2)-O Cu(100) surface, rectangular Cu islands with (2 2 × 2 )R45°−O structure are grown in the [010] and [001] directions. These phenomena are well rationalized by the stress induced by the adsorption of oxygen four-fold hollow sites.
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