Near-Surface Buckling in Strained Metal Overlayer Systems
- 4 December 1995
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 75 (23) , 4242-4245
- https://doi.org/10.1103/physrevlett.75.4242
Abstract
Scanning tunneling microscopy (STM) images of Ag films grown on Ru(0001) reveal a periodic unit cell with a structural transformation at silver coverages slightly less than one monolayer. Dislocations in the overlayers are similar to the Au(111) herringbone structure; however, Ag/Ru(0001) exhibits two novel differences from previously observed herringbone structures. First, the unit cell dimensions change dramatically as a function of coverage. Second, STM images of Ag/Ru(0001) are inverted relative to those for Au(111). We show that this image inversion is due to substantial relaxations perpendicular to the surface resulting from local strains in the silver overlayer.Keywords
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