SKM 2023 – scientific programme
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O: Fachverband Oberflächenphysik
O 47: 2D Materials II: Growth, Structure and Substrate Interaction I
O 47.4: Talk
Wednesday, March 29, 2023, 11:15–11:30, GER 37
Formation of Europium transition metal surface compounds and its protection below hBN — •Alaa Mohammed Idris Bakhit1,2, Khadiza Ali3,4, Anna A. Makarova4,5, Igor Piš6, Federica Bondino6, and Frederik Schiller1,4 — 1MPC, San Sebastián, Spain — 2Universidad del País Vasco, San Sebastián, Spain — 3Chalmers University of Technology, Göteborg, Sweden — 4DIPC, San Sebastián, Spain — 5FU Berlin, Germany — 6IOM-CNR, Trieste, Italy
We present a comparative study of the electronic and structural properties of hBN on curved transition metal (TM) substrates, namely, Ni, Rh and Pt crystals and their modifications after Eu intercalation. hBN was grown by CVD processes. The growth quality depends strongly on the lattice mismatch and the overlayer-substrate interaction. The interface properties could be influenced by tuning the substrate material and its step density. That was shown by hBN growth on curved crystals that feature strong (Ni), medium (Rh) or weak (Pt) substrate interaction. The structural properties were investigated by Low-energy electron diffraction (LEED) and scanning tunnelling microscopy (STM). Stable facets are formed upon hBN growth on the substrates, which are changed after Eu intercalation. A formation of Eu-TM alloy is detected. The electronic structure was characterized by X-ray photoelectron spectroscopy (XPS) and angle-resolved photoemission measurements (ARPES). We studied the possible protection of Eu by the hBN layer. We observe that Eu protection was incomplete due to defects and hBN growth boundaries which resulted in Eu oxidation.