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O: Fachverband Oberflächenphysik

O 102: Epitaxy and growth: Metals and semiconductors II

O 102.1: Vortrag

Freitag, 18. März 2011, 11:15–11:30, WIL C307

Growth of Pb on Mo(110) studied by scanning tunneling microscopy. Comparison with the growth of Au, Ag and Sn on Mo(110) — •Aleksander Krupski — Institute of Experimental Physics, University of Wrocław, pl. Maxa Borna 9, 50-204 Wrocław, Poland

Scanning tunneling microscopy (STM) has been used for the first time to investigate the growth behaviour of ultra-thin Pb, Ag, Au and Sn films on the Mo(110) surface. The analysis of STM measurements indicates that for a coverage < 1 ML two-dimensional growth of the first Pb monolayer (wetting layer) took place. Above > 1 ML, the three-dimensional growth of the Pb islands with strongly preferred atomic scale *magic height* and flat top is observed. At coverages between 1 ML and 2 ML, only islands containing two atomic layers of Pb are observed. At coverages between 2 ML and 3 ML, islands containing two and four atomic layers of Pb are observed. At higher coverages above 3 ML, the island height distribution shows peaks at relative heights corresponding to N = (2, 4, 6, 7 and 9) of Pb atomic layers. In addition, closer view show coexistence of two well-ordered surface superstructures in the first lead layer. Results presented for growth of Pb will be compared with growth of Ag, Au, and Sn on Mo(110).