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arXiv · 2311.15700

Evolution of the surface atomic structure of multielement oxide films: curse or blessing?

Giada Franceschi·Renè Heller·Michael Schmid·Ulrike Diebold·Michele Riva
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Abstract

Atomically resolved scanning tunneling microscopy (STM) and x-ray photoelectron spectroscopy (XPS) are used to gain atomic-scale insights into the heteroepitaxy of lanthanum-strontium manganite (LSMO, La$_{1-x}$Sr$_x$MnO$_{3-{\delta}}$, $x$ $\approx$ 0.2) on SrTiO$_3$(110). LSMO is a perovskite oxide characterized by several composition-dependent surface reconstructions. The flexibility of the surface allows it to incorporate nonstoichiometries during growth, which result in composition-dependent surface atomic structures. This happens up to a critical point, where phase separation occurs, clusters rich in the excess cations form at the surface, and films show a rough morphology. To limit the nonstoichiometry introduced by non-optimal growth conditions, it proves useful to monitor the changes in surface atomic structures as a function of the PLD parameters and tune the latter accordingly.

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Giada Franceschi, Renè Heller, Michael Schmid, Ulrike Diebold, Michele Riva. 2023-11-27. Evolution of the surface atomic structure of multielement oxide films: curse or blessing?. https://doi.org/10.1039/d3na00847a

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