Two-dimensional surface phase diagram of a multicomponent perovskite oxide: La0.8Sr0.2MnO3(110)

G. Franceschi, M. Schmid, U. Diebold, M. Riva

Institut für Angewandte Physik, TU Wien, 1040 Wien, Austria

Phys. Rev. Materials 5 (2021) L092401

The many surface reconstructions of (110)-oriented lanthanum strontium manganite (La0.8Sr0.2MnO3, LSMO) were followed as a function of the oxygen chemical potential (μO) and the surface cation composition. Decreasing μO 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, and these results were used to build a two-dimensional phase diagram of the LSMO(110) equilibrium surface structures.

Corresponding author: Michele Riva (riva at iap_tuwien_ac_at).

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