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O: Fachverband Oberflächenphysik

O 30: Metal & Semiconductor substrates: Structure, epitaxy and growth – Poster

O 30.1: Poster

Montag, 9. März 2026, 18:00–20:00, P2

Structural analyses for S and Te on transition metal chain-like phases on the Ir(100) substrate — •Eric Engel, Alexander Wegerich, and M. Alexander Schneider — Universität Erlangen-Nürnberg, 91058 Erlangen, Germany

The magnetic properties of one-dimensional transition metal oxide chains Ir(100)-(3× 1)-MO2 (M = Mn, Fe) [1,2] may in the case of Mn be tuned by changing the number of oxygen atoms in the chain structure [3]. Here, we present our attempts to replace O by S and Te and the quantitative LEED-IV analyses of the resulting structures.

Dosing H2S to the MnO2 or FeO2 chains leads to the formation of a dominant c(2× 2) superstructure. The structural analyses reveal with Pendry R-factors RP < 0.11, that reduced transition metal chains remain as ordered (3× 1) structures in the surface layer. The true unit cell of the system is hence a c(6 × 2) but with only little deviations in the S adsorbate layer from a c(2× 2).

For Te, MO2 chains were reduced in H2 first, followed by Te deposition. In the case of 1/6 ML Te on the Ir(100)-(3× 1)-FeIr2 a (3× 2)-Te superstructure emerges, where the Te atoms take positions on pure Ir hollow sites between the Fe-chains (RP = 0.123). For 1/2 ML Te a dominant c(2× 2) superstructure appears, again with only slight influences of the metal chains in the Ir(100) surface adsorbate positions.

[1] P. Ferstl et al., Phys. Rev. Lett. 117, 046101 (2016)
[2] M. Schmitt et al., Phys. Rev. B 100, 054431 (2019)
[3] J. Qi et al., Phys. Rev. B 107, 060409 (2023)

Keywords: sulphur; tellurium; iridium; LEED-IV