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O: Oberflächenphysik

O 34: Oxide und Isolatoren

O 34.7: Vortrag

Donnerstag, 11. März 2004, 12:45–13:00, H45

SPA-LEED Studies of CoO Thin Films on Ag(100) — •Jian Wang, Ina Sebastian, Karl-Michael Schindler, Klaus Meinel, Henning Neddermeyer, and Wolf Widdra — Martin-Luther-Universität Halle-Wittenberg, FB Physik, D-06099 Halle

The growth morphology of CoO films deposited in the temperature range of 300-500 K has been studied by Spot Profile Analysis of Low Energy Electron Diffraction (SPA-LEED). At a coverage of 3 ML the growth is pseudomorphic to the Ag(100) substrate with a compression of 4% in the CoO film. Relaxation to the bulk lattice of CoO occurs at a coverage of 6 ML. At 10 ML, splitting of the (00) spot indicates the presence of terraces which we relate to the carpet growth mode of the film. Upon annealing in O₂ at 500 K, both CoO(100) and CoO(111) structures were found, whereby the (111) structure shows a (√3 × √3)R30^∘ reconstruction. The corresponding structural model will be presented.