Berlin 2024 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 90: 2D Materials VI: Growth, Structure and Substrate Interaction
O 90.4: Vortrag
Donnerstag, 21. März 2024, 15:45–16:00, MA 005
Formation of Europium-Ruthenium surface compound and protection of Eu below hexagonal boron nitride (h-BN) — •Alaa Mohammed Idris Bakhit1,3 and Frederik Schiller1,2 — 1Centro de Física de Materiales CSIC-UPV/EHU-Materials Physics Center, E-20018 San Sebastián, Spain — 2Donostia International Physics Center, E-20018 Donostia-San Sebastián, Spain — 3Departamento de Física Aplicada I, Universidad del País Vasco UPV/EHU, E-20018 San Sebastián, Spain
We investigate the structural and electronic properties of Europium (Eu) intercalated beneath a layer of hexagonal Boron nitride (h-BN) atop of transition metal Ruthenium Ru(0001) substrate. The hBN monolayer was grown by the Chemical Vapor Deposition process on clean Ru(0001). To explore the structural aspects, we employed Low-energy electron diffraction (LEED). Our observations from LEED revealed c(4×2) and (2×2) superstructures emerging upon Eu intercalation, varying based on the Eu coverage. Simultaneously, the electronic structure was investigated by X-ray photoelectron spectroscopy (XPS) and angle-resolved photoemission measurements (ARPES). Notably, XPS analysis post-Eu intercalation indicated the presence of Eu in a divalent valence state. Furthermore, we studied the possible protection of Eu by the h-BN layer on the Ru(0001) substrate. We observe that partially Eu can be protected but full protection was incomplete probably due to defects and h-BN growth boundaries which facilitated Eu oxidation.