Berlin 2024 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 95: Electronic Structure of Surfaces II: Spectroscopy, Surface States
O 95.6: Vortrag
Donnerstag, 21. März 2024, 16:15–16:30, MA 144
On the unoccupied electronic structure of Fe3O4(100) — •Jan Bieling and Markus Donath — Universität Münster, Germany
The (100) surface of magnetite (Fe3O4) undergoes a (√2 × √2)R45∘ reconstruction. While its occupied states have been extensively investigated, studies addressing the empty ones are lacking.
We examined the unoccupied electronic structure of a pristine and well-characterized Fe3O4(100) surface by angle-resolved inverse photoemission. A threefold split, almost non-dispersive 3d-related spectral feature is observed. It is attributed to band groups originating from tetrahedrally and octahedrally coordinated iron atoms. The latter give rise to two spectral features since the t2g and eg orbitals are non-degenerate due to crystal-field splitting.
Based on our present study, we showcase the inherent limitations of using the second derivative to analyze electron spectroscopical data. Extracted peak positions can significantly deviate from the underlying ones, as demonstrated by synthetically generated spectra.
Keywords: magnetite; inverse photoemission