Regensburg 2025 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 74: Poster Metal and Semiconductor Substrates: Structure, Epitaxy and Growth

O 74.5: Poster

Mittwoch, 19. März 2025, 18:00–20:00, P2

Structure of tellurium phases on Ni(111) and Ni(111)-(1×1)-2C (graphene) — •Alexander Wegerich, Gwyn R. Thomas, Andreas Raabgrund, and M. Alexander Schneider — Universität Erlangen-Nürnberg, 91058 Erlangen, Germany

Using quantitative LEED-IV analyses, STM and DFT, we examine Te on Ni(111) to understand the interactions and emerging structures. For Θ_Te = 0.33 ML a (3×√3)_rect-2Te superstructure is identified. For Θ_Te = 0.40 ML this changes to a (5×√3)_rect-4Te superstructure. As LEED-IV analyses reveal, these superstructures are identical to those that can be observed for the Te/Cu(111) system [1], albeit with different stacking and reduced Te-Metal bond length.

In addition, we also present our first results regarding Te on the well-known Ni(111)-(1×1)-2C (graphene) structure [2, 3]. The presence of Te reduces the thermal stability of the graphene on Ni(111). At annealing temperatures above 570 K the graphene begins to dissolve and structures for the Te/Ni(111) system emerge. In the course of our studies, we also determined the Ni(111)-(1×1)-2C (graphene) structure by LEED-IV analysis and obtained picometer accuracy by virtue of a low Pendry R-factor of R = 0.10.

[1] T. Kißlinger et al., Phys. Rev. B 104, 155426 (2021)
[2] J. Lahiri et al., New J. Phys. 13, 25001 (2011)
[3] Y. Gamo et al., Surface Science 374, 61-64 (1997)

Keywords: tellurium; nickel; graphene; LEED-IV