Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 35: Poster Session II (Polymeric biomolecular films; Nanostructures; Electronic structure; Spin-orbit interaction; Phase transitions; Surface chemical reactions; Heterogeneous catalysis; Particles and clusters; Surface magnetism; Electron and spin dynamics; Surface dynamics; Methods; Electronic structure theory; Functional molecules)
O 35.122: Poster
Dienstag, 27. März 2012, 18:15–21:45, Poster B
Setup and characterization of a new-built 300 mK ultra high vacuum scanning tunneling microscope — •Danny Baumann1, Torben Hanke1, Christian Hess1, Marko Kaiser2, Ralf Voigtländer2, Dirk Lindackers2, and Bernd Büchner1 — 1Institut für Festkörperforschung, IFW Dresden — 2Bereich Forschungstechnik, IFW Dresden
We present the setup and characterization measurements of a newly built ultra high vacuum (UHV) 300 mK scanning tunneling microscope (STM). The used cryostat is a bottom loading 3He single shot system equipped with a 9T superconducting magnet and connected to a three-chamber UHV system. The UHV system gives the possibility to prepare, store and analyze tips and samples and mount them in the STM without breaking the UHV conditions.
Furthermore, we show the very high spatial resolution as well as the very high long-term stability of the STM system with measurements on standard samples and investigations on the iron pnictide superconductor LiFeAs.
Additionally, we have performed scanning tunneling spectroscopic measurements with a superconducting Niobium tip to show that the energy resolution of the STM at base temperature is close to the thermal limit.