Berlin 2018 – scientific programme

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O: Fachverband Oberflächenphysik

O 80: Poster: Scanning Probe Techniques - Method Development

O 80.12: Poster

Wednesday, March 14, 2018, 18:15–20:30, Poster A

Design of a 30 mK scanning tunneling microscope for spin-polarized measurements — •Sebastian Schimmel, Danny Baumann, Alexander Horst, Ralf Voigtländer, Dirk Lindackers, Bernd Büchner, and Christian Hess — IFW Dresden, Helmholtzstrasse 20, 01069, Dresden, Germany

In order to obtain experimental access and to disentangle the intertwined phases found in unconventional superconductors, which are namely the electronic ordering, superconductivity and static magnetism, we designed the presented milli-Kelvin scanning tunneling microscope (STM) system for spin-polarized investigation with very high resolution in energy as well as in real space. Using a 3He/4He Dilution Refrigerator allows to cool the tip and sample to a measurement temperature of 30 mK that improves the energy resolution to the corresponding value of only about 15 micro-eV and enables to study all classes of unconventional superconductors, also including heavy fermion compounds. Long term measurements at base temperature can be performed for up to 7 days. A 9-4 T vector magnet allows the systematic in-situ manipulation of the spin-polarization axis. For the preparation of tips and samples for spin-polarized STM measurements, a UHV chamber has been designed with a suitable system for tip/sample transfer. The suppression of disruptive vibrations is done by a two stage passive/active damping system.