Regensburg 2019 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 49: Poster Session: Superconductivity
TT 49.18: Poster
Mittwoch, 3. April 2019, 15:00–18:30, Poster D
Design of a 30 mK STM for spin-polarized measurements — •Sebastian Schimmel, Danny Baumann, Alexander Horst, Ralf Voigtländer, Dirk Lindackers, Saicharan Aswartham, Sabine Wurmehl, Bernd Büchner, and Christian Heß — IFW-Dresden; Helmholtzstraße 20; 01069 Dresden
We present a scanning tunneling microscope (STM) system which is especially designed to perform investigations with spin-polarization and 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 which improves the energy resolution to the micro-eV-scale 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 UHV system will be employed to prepare tips and samples for spinpolarized STM measurements. Furthermore, a 9-4 T vector magnet allows the systematic in-situ manipulation of the spin-polarization axis. The whole apparatus is suspended on a sophisticated two-stage passive/ active damping system. Therefore, this instrument constitutes a novel approach to reveal the ubiquitous interplay of superconductivity, magnetism and electronic order in unconventional superconductors.