Role of surface elastic relaxations in an O-induced nanopattern on Pt(110)-(1 x 2) |
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Authors: | Helveg S Li W X Bartelt N C Horch S Laegsgaard E Hammer B Besenbacher F |
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Institution: | Department of Physics and Astronomy, Interdisciplinary Nanoscience Center (iNANO), University of Aarhus, DK-8000 Aarhus C, Denmark. |
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Abstract: | Scanning tunneling microscopy shows that a nanopattern forms as the Pt(110)-(1 x 2) surface is exposed to oxygen at room temperature or above. The nanopattern consists of 11over]0] oriented O-induced stripes assembling into a (11 x 2) superstructure at high O coverage. The stripes form because the O adsorption energy increases by expanding the Pt lattice along the ridges of the surface as compared to the bulk. From interplay with density functional theory calculations, we show that the O-induced nanoscale periodicity is caused by short-ranged elastic relaxations confined to the surface. |
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