Berlin 2008 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 7: Matter at Low Temperature: Poster Session
TT 7.9: Poster
Montag, 25. Februar 2008, 14:00–18:00, Poster B
Development of a very low temperature scanning tunneling microscope — •Michael Marz1,2, Gernot Goll1, and Hilbert v. Löhneysen1,2,3 — 1Physikalisches Institut Universität Karlsruhe (TH), 76128 Karlsruhe — 2DFG-Centrum für Funktionelle Nanostrukturen der Universität Karlsruhe (TH), 76128 Karlsruhe — 3Institut für Festkörperphysik Forschungszentrum Karlsruhe, 76021 Karlsruhe
Scanning tunneling microscopy (STM) and spectroscopy (STS) are well known techniques. STM allows to study topological surface properties of conductive materials. With STS one can measure the energy dependence of the local density of states (LDOS), as the tunneling current is a function of the LDOS and energy. In order to use the technique at very low temperatures and high magnetic fields, we installed a home-built scanning tunneling microscope into a dilution refrigerator, where we can reach temperatures down to 30 mK and apply magnetic fields up to 13 T. In order to improve both spatial and energy resolution, considerable efforts were taken to electrical filtering and mechanical damping of our system. First test measurements were done with a commercially available AuPd grid with a lattice constant of 160 nm. We also achieved atomic resolution on HOPG and NbSe2 at room temperature and on NbSe2 at 50 mK.