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Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 65: Poster Wednesday: Surface Structure, Epitaxy and Growth

O 65.2: Poster

Mittwoch, 3. April 2019, 17:45–20:00, Poster B1

Structural investigation of strain induced effects in a Dy-Ag surface alloy — •Sina Mousavion1, Johannes Seidel1, Lu Lyu1, Maniraj Mahalingam1, Benjamin Stadtmüller1,2, and Martin Aeschlimann11Department of Physics and Research Center OPTIMAS, Erwin Schroedinger Straße 46, 67663 Kaiserslautern, Germany — 2Graduate School of Excellence Materials Science in Mainz, Erwin Schroedinger Straße 46, 67663 Kaiserslautern, Germany

Studies of intermetallic compounds using lanthanide metals on noble metals have been subject of numerous studies due to their tunable structure as well as their electronic and magnetic properties [1]. In this study we focus on the structural properties of a Dysprosium-Ag surface alloy formed on the Ag(111) surface. Using LEED and STM, we observe the formation of a short range ordered Dy-Ag structure with an additional Moiré-like pattern. This is in contrast to most surface alloys which usually form a uniform Sqrt(3)xSqrt(3) structure on Ag(111). This intriguing surface structure can be explained by a non-uniform lattice strain in the adsorbate system due to the size mismatch of Dy and Ag. We propose that the formation of a Moiré pattern of the surface alloy can be used to control the structure formation of adsorbates on this surface alloy. [1] e.g., Nano Lett., 16, 4230-4235 (2016)

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