Dresden 2006 – scientific programme

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O: Oberflächenphysik

O 29: Poster session II (Nanostructures, Magnetism, Particles and clusters, Scanning probe techniques, Time-resolved spectroscopy, Structure and dynamics, Semiconductor surfaces and interfaces, Oxides and insulators, Solid-liquid interfaces)

O 29.76: Poster

Wednesday, March 29, 2006, 14:30–17:30, P2

Ultrathin vanadium oxide films on W(110) investigated by LEEM — •Benjamin Borkenhagen, Gerhard Lilienkamp, and Winfried Daum — Institut für Physik und Physikalische Technologien, TU Clausthal, Leibnizstr. 4, D-38678 Clausthal-Zellerfeld

Vanadium oxide films with thicknesses in the range between submonolayer and several monolayers were epitaxially grown on a W(110) single crystal under UHV conditions. Depending on the growth conditions, LEED investigations revealed various well-ordered superstructures, e. g. with 2x2 symmetry, and a hexagonal film in Kurdjumov-Sachs orientation. Cleanness and composition of the films were checked by Auger spectroscopy. Low energy electron microscopy (LEEM) of the vanadium oxide-covered tungsten surface showed a flat surface with monoatomic steps. Dark field images using one or more diffraction spots revealed the growth process and the distribution of different domains of the vanadium oxide. The sample was also investigated in situ during annealing under oxidizing and reducing conditions, respectively. Structural transitions are correlated with the oxygen content in the film and alloying of vanadium with the tungsten substrate.