Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 63: Posters: Scanning Probe Methods
O 63.26: Poster
Mittwoch, 2. April 2014, 17:30–21:00, P2
Versatile and compact UHV-System for Scanning Tunneling, Scanning Force and Transport Measurements exhibiting an operation time of 10 days below T=400 mK and at B=±14 T — •Jan Raphael Bindel, Mike Pezzotta, Stefan Becker, Marcus Liebmann, and Markus Morgenstern — II. Institute of Physics B, RWTH Aachen, Germany
We use a UHV cryostat which hosts a fully UHV compatible He3 cryostat with charcoal pump. The He3 is condensed in mechanical contact with a 1 K pot, but decoupled afterwards providing low mechanical noise. The base temperature is 380 mK with a hold time greater than 10 days. Optical access enables in-situ tip and sample exchange and evaporation into the cooled microscope at 4.2 K. The home-built microscope allows conventional scanning tunneling microscopy and spectroscopy, non-contact atomic force microscopy via a qPlus sensor and magnetotransport measurements of the samples using five contacts at the same sample position, where scanning tunneling microscopy is performed. An xy table allows positioning of the tip with respect to the sample over 2x2 mm2. For sample preparation and analysis, a three chamber ultrahigh vacuum system with a base pressure of 10−8 Pa has been built including low-energy electron diffraction (LEED), Auger electron spectroscopy, sputtering, annealing and evaporation. The whole system has a total height of only 2.60 m. STM images are presented with noise level in z-direction below 2 pm, lateral drift below 40 pm/h obtained at currents down to 500 fA.