Berlin 2005 – wissenschaftliches Programm

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O: Oberflächenphysik

O 48: Oxide und Isolatoren II

O 48.3: Vortrag

Dienstag, 8. März 2005, 16:15–16:30, TU EB107

Oxidation and reduction of thin molybdenum oxide layers on Cu₃Au(100) — •Jürgen Middeke, Ralf-Peter Blum, and Horst Niehus — Humboldt-Universität zu Berlin, Institut für Physik, ASP, Newtonstr. 15, 12489 Berlin

Recently it has been shown that well defined two dimensional vanadium oxide layers can be created on a Cu₃Au(100) surface [1]. The most important step of the preparation technique seems to be oxygen implantation and subsequent annealing of the alloy substrate prior to the transition metal evaporation. Meanwhile the technique was also successfully applied to niobium oxide and molybdenum oxide formation. In this presentation we will focus on oxidation and reduction processes observable at different phases of MoO_x that exhibit either rectangular or hexagonal symmetry. The oxidation and reduction has been followed in situ on an atomic scale by scanning tunneling microscopy.

[1] H. Niehus R.-P. Blum and D. Ahlbehrendt, phys. stat. sol. (a) 187 (2001) 151