Interface of Pt with SrTiO_3(001); A combined theoretical and experimental study

摘要

Density Functional Theory and X-ray standing wave atomic imaging are combined to develop models of platinum overlayers, patches and small particles on (001) surfaces of SrTiO_3. The higher coverage (0.3 ML nominal Pt) experimental result matches best to a simple 1×1 surface model. For lower coverage (0.1 ML) a Ti deficient TiO_2 double layer termination is identified as most favorable. A simple model is developed by which XSW amplitudes can be used to infer the aspect ratio of surface structures.