Abstract
The formation of surface Au/Pb alloys on a Pb-induced Si(111)-√3×√3 surface is investigated using scanning tunneling microscopy (STM). Two types of alloy islands, compact and loose islands, have been observed. The former shows a long-range ordered 3×3-Au/Pb reconstruction corresponding to an Au0.57Pb0.43 alloy, while the latter is not totally disordered with a short-range ordered structure. Based on the atomic structure of the substrate around the compact islands, Si atoms are excluded in the formation process of the Au/Pb surface alloys.
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