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Strain-induced creation and switching of anion vacancy layers in perovskite oxynitrides.

Takafumi YamamotoAkira ChikamatsuShunsaku KitagawaNana IzumoShunsuke YamashitaHiroshi TakatsuMasayuki OchiTakahiro MaruyamaMorito NambaWenhao SunTakahide NakashimaFumikata TakeiriKotaro FujiiMasatomo YashimaYuki SugisawaMasahito SanoYasushi HiroseDaiichiro SekibaCraig M BrownTakashi HondaKazutaka IkedaToshiya OtomoKazuhiko KurokiKenji IshidaTakao MoriKoji KimotoTetsuya HasegawaHongcheng Lu
Published in: Nature communications (2020)
Perovskite oxides can host various anion-vacancy orders, which greatly change their properties, but the order pattern is still difficult to manipulate. Separately, lattice strain between thin film oxides and a substrate induces improved functions and novel states of matter, while little attention has been paid to changes in chemical composition. Here we combine these two aspects to achieve strain-induced creation and switching of anion-vacancy patterns in perovskite films. Epitaxial SrVO3 films are topochemically converted to anion-deficient oxynitrides by ammonia treatment, where the direction or periodicity of defect planes is altered depending on the substrate employed, unlike the known change in crystal orientation. First-principles calculations verified its biaxial strain effect. Like oxide heterostructures, the oxynitride has a superlattice of insulating and metallic blocks. Given the abundance of perovskite families, this study provides new opportunities to design superlattices by chemically modifying simple perovskite oxides with tunable anion-vacancy patterns through epitaxial lattice strain.
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