Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 37: Metal Oxide Surfaces II: Structure, Epitaxy and Growth

O 37.11: Vortrag

Dienstag, 2. April 2019, 16:30–16:45, H16

Evidence of a nanosize regime in oxide/metal heteroepitaxy — •Claudine Noguera1, Jacek Goniakowski1, Gregory Cabailh1, Jacques Jupille1, Rémi Lazzari1, Jingfeng Li1, Pierre Lagarde2, and Nicolas Trcera21CNRS, Sorbonne Université, Institut des NanoSciences de Paris, UMR 7588, 4 Place Jussieu, F-75005 Paris, France — 2Synchrotron SOLEIL, Orme des Merisiers, St-Aubin, BP48, F-91192 Gif sur Yvette, France

The growth mode of strained epitaxial films relies on the interaction strength, the lattice matching and the mechanical response of the system. The present work focuses on the basic physics of supported nano-islands by examining the characteristics of MgO/Ag(100) taken as a case study. By a combination of experiments and simulations, we highlight the existence of a small size regime in which, despite the largest adhesion and the smallest mismatch, the islands are the least distorted by the substrate. We assign this unexpected behaviour to the enhanced island stiffness which makes the cost of elastic distortion prohibitive compared to the associated gain of MgO-Ag interaction energy. The analysis provides a general framework to predict and/or understand nanoscale effects on interfacial pseudomorphy. These are likely to hold whatever the nature of the deposit and substrate under consideration. It may have far reaching consequences on many properties of supported nano-objects.

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