Regensburg 2010 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 34: Methods: Scanning probe techniques IV
O 34.1: Vortrag
Dienstag, 23. März 2010, 15:00–15:15, H32
Temperature Performance and Concept of an Ultra High Vacuum Compatible Dilution Refrigerator System for Scanning Tunneling Microscopy Applications — •Maximilian Assig1, Fabian Zinser1, Vladimir Shvarts2, Zuyu Zhao2, Christian R. Ast1, and Klaus Kern1 — 1Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany — 2JANIS research company, USA
The investigation of novel physical phenomena implies the design and the construction of new setups and measurement techniques, which can break through instrumental limitations and open new areas in measurement accuracy. Scanning Tunneling Microscopy (STM) is a technique for probing the electronic structure of single adsorbed atoms and nanostructures at surfaces with atomic resolution. This contribution deals with the concept and performance of an ultra high vacuum (UHV) compatible dilution refrigerator (DR) system which is specially adapted for STM measurements in high magnetic field of 14 T perpendicular and 0.5 T parallel to the sample surface. We will give an overview of the temperature calibration in combination with base temperature and cooling power characterisation of our DR system. First tests of the STM head attached to the DR show heating at the tip and the sample due to the motion of the piezo in the scanning process. In idle conditions it was possible to reach a base temperature of 14mK at tip and sample. In addition, we will present further milestones in the project realisation.