Regensburg 2004 – wissenschaftliches Programm

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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.

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