Berlin 2024 – scientific programme

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O: Fachverband Oberflächenphysik

O 39: Poster: Metal Substrates

O 39.10: Poster

Tuesday, March 19, 2024, 18:00–20:00, Poster D

Structure of tellurium phases on Fe/Ir(111) — •Alexander Wegerich, Tilman Kisslinger, Lutz Hammer, and M. Alexander Schneider — Universität Erlangen-Nürnberg, 91058 Erlangen, Germany

Within the group of transition metal chalcogenides (TMCs), iron tellurides hold great promise in terms of their magnetic and electronic properties [1-2]. A way to prepare such systems in a scalable way accessible for surface science methods is to induce reactions between Te and Fe at the surface of a chosen substrate in ultra-high vacuum. Ir(111) was chosen, since no (surface) telluride formation was observed on Ir(111) enhancing the chance of iron telluride growth upon deposition of Fe and Te.

By quantitative LEED-IV analyses, STM and DFT, we determine the occurring surface structures as function of Te and Fe content and preparation temperatures. No iron telluride phases but the formation of Te adphases on pseudomorphic Fe layers on Ir(111) were observed. At Θ_Te = 0.25 ML a stable Fe/Ir(111)-(2×2)-Te occurs that has no counterpart on the bare Ir(111) surface, whereas increasing Θ_Te to 0.33 ML and beyond produces a (√3×√3)R30^∘ adsorbate phase that can be further compressed to accommodate more Te, exactly as for Te on Ir(111).
[1] Z. Zhang et al., Phys. Rev. Mater. 4, 125003 (2020)
[2] D. Fobes et al., Phys. Rev. Lett. 112, 187202 (2014)

Keywords: iron; tellurium; iridium; structure