Dresden 2026 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 48: Metal & Semiconductor substrates: Structure, epitaxy and growth

O 48.2: Vortrag

Dienstag, 10. März 2026, 14:45–15:00, HSZ/0204

Structural analysis of the interaction of H2S with the FeO2 chain phase on Ir(100) — •Alexander Wegerich, Eric Engel, and M. Alexander Schneider — Universität Erlangen-Nürnberg, 91058 Erlangen, Germany

On the Ir(100) surface, a self-organised growth of oxide chains of the form Ir(100)-(3× 1)-MO2 (M = Mn, Fe, Co and Ni) can be observed. These transition metal oxide chains are shifted by half an Ir(100) lattice constant with respect to the iridium rows [1]. Furthermore, it is possible to reduce these oxide chains to an Ir(100)-(3× 1)-MIr2 (M = Mn, Fe, Co and Ni) surface alloy by annealing under H2 atmosphere, now with the reduced chains aligned to the Ir rows [2].

Using quantitative LEED-IV analyses, STM and DFT, we examine whether the iron oxide chain phase can be structurally changed and/or tuned by reaction with S, the only other non-metallic chalcogen. In contrast to oxygen, sulphur does not create a Ir(100)-(3× 1)-FeS2 chain-like phase, but a c(6× 2) superstructure. Prepared by annealing the FeO2 chains under a H2S atmosphere, the oxide chains are reduced and sulphur adsorbes on them. The so-formed c(6× 2) can be interpreted as a c(2× 2)-S adphase on the Ir(100)-(3× 1)-FeIr2 chains.

[1] P. Ferstl et al., Phys. Rev. Lett. 117, 046101 (2016)
[2] P. Ferstl et al., Phys. Rev. B 96, 085407 (2017)

Keywords: sulphur; iron; iridium; LEED-IV