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O: Fachverband Oberflächenphysik
O 17: Poster Session I (Nanostructures at Surfaces; Metal Substrates: Epitaxy and Growth; Methods: Scanning Probe Techniques; Phase Transitions)
O 17.8: Poster
Montag, 26. März 2007, 17:30–20:30, Poster C
The metal-insulator transition of Rb:TaS2 observed with PEEM — Jens Buck1, •Ole Mühlfeld1, Kai Rossnagel1, Florian Kronast2, Ruslan Ovsyannikov2, Hermann Dürr2, and Lutz Kipp1 — 1Christian-Albrechts-Universität zu Kiel — 2BESSY, Berlin
The transition metal dichalcogenide TaS2 exhibits a change from metallic to insulating behavior upon deposition of rubidium. We present first results of this system studied by PEEM. Measurements with a spatial resolution of about 100 nm reveal the transition from metal to insulator in the presence of rubidium. Among other layered crystals, TaS2 shows the well-known formation of nanowire networks when rubidium is deposited. Here, evaporation-induced surface features with a mesh-like structure and a size distribution between some microns and the resolution limit were observed. They appear to be independent of local changes in rubidium concentration. The experiments were carried out at BESSY, beamline UE49-PGMa. This work was supported by the Deutsche Forschungsgemeinschaft, Forschergruppe 353.