Dresden 2026 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 42: Electronic structure of surfaces: Spectroscopy, surface states – Poster
O 42.2: Poster
Dienstag, 10. März 2026, 14:00–16:00, P2
Hydrogen Plasma Cleaning of Fe3Sn2 single crystals for surface-sensitive measurements — •Felix Müller1, Lu Lyu1, Lilian Prodan1, Jannis Leßmeister2, Tobias Eul1, Martin Aeschlimann2, István Kézsmárki1, and Benjamin Stadtmüller1 — 1University of Augsburg — 2RPTU University Kaiserslautern-Landau
Preparing clean and well-defined surfaces is essential for high-resolution photoemission spectroscopy (PES) and other similarly surface-sensitive studies. Typical preparation methods to realize high-quality surfaces include in situ cleaving under ultrahigh vacuum (UHV) conditions. However, this method cannot be universally applied to all crystal structures. Alternative approaches can rely, for instance, on H2-based plasma cleaning using H2 sources integrated into a UHV system. Here, we investigate the effectiveness of this method in preparing Fe3Sn2 surfaces for spectroscopy and discuss its potential as a general cleaning technique for other topological bulk materials.
We show that the hydrogen plasma efficiently removes common surface contaminants, particularly oxygen and carbon, while preserving the intrinsic surface structure. This enables the observation of sharp spectroscopic features over the whole energy range and significantly enhances the signal quality of subsequent PES measurements. Our results show that plasma can be a simple and reproducible method for achieving contamination-free surfaces of topological bulk materials for surface-sensitive spectroscopy applications.
Keywords: Plasma Cleaning; Fe3Sn2; surface-sensitive