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arXiv · 2010.05205

2D Surface Phase Diagram of a Multicomponent Perovskite Oxide: La$_{0.8}$Sr$_{0.2}$MnO$_3$(110)

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

The many surface reconstructions of (110)-oriented lanthanum--strontium manganite (La$_{0.8}$Sr$_{0.2}$MnO$_3$, LSMO) were followed as a function of the oxygen chemical potential ($\mu_\text{O}$) and the surface cation composition. Decreasing $\mu_\text{O}$ causes Mn to migrate across the surface, enforcing phase separation into A-site-rich areas and a variety of composition-related, structurally diverse B-site-rich reconstructions. The composition of these phase-separated structures was quantified with scanning tunneling microscopy (STM), and these results were used to build a 2D phase diagram of the LSMO(110) equilibrium surface structures.

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Giada Franceschi, Michael Schmid, Ulrike Diebold, Michele Riva. 2020-10-11. 2D Surface Phase Diagram of a Multicomponent Perovskite Oxide: La$_{0.8}$Sr$_{0.2}$MnO$_3$(110). https://doi.org/10.1103/physrevmaterials.5.l092401

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