Abstract
Topotactic Transitions In article number 2104356, Lei Cao, Oleg Petracic, and co-workers report the first observation of a novel surface phase in La0.7Sr0.3MnO3-δ epitaxial thin films during the topotactic transition from perovskite to brownmillerite. Given the anisotropic vacancy channels found in the surface phase, the studies not only provide a deeper understanding of oxygen-transport behavior in oxides, but also offer optimal guidance to engineer coordination polyhedra towards desired properties.
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