Dresden 2006 – wissenschaftliches Programm
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O: Oberflächenphysik
O 24: Adsorption III
O 24.11: Vortrag
Dienstag, 28. März 2006, 18:15–18:30, TRE Phys
Rb adsorption and intercalation on TaS2 — •Patrick Schmidt, Jörg Kröger, and Richard Berndt — Institut für Experimentelle und Angewandte Physik, Universität Kiel, D-24098 Kiel, Germany
We report results of scanning tunnelling microscopy at room temperature (RT) and low temperature (LT, 9 K) of TaS2 exposed to Rb. All samples are prepared by evaporating several monolayers of Rb at RT. STM topographs at RT show a ∼1 Å deformation of the first layer of TaS2 on a ∼1000 Å lateral scale indicating Rb intercalation. Additionally the step height of TaS2-Rb is increased by 3 Å compared to pristine TaS2. This value corresponds to the ionic radius of Rb. Finally, the hexagonal √13 × √13 charge density wave of TaS2 changes to a rectangular phase. After evaporating ∼4 monolayer (ML) of Rb we observe at LT Rb adatoms residing at maxima of the charge density wave. For higher exposure (∼9 ML) the pattern changes to unordered arrangement of maxima with a typical nearest neighbour distance of 11 Å.