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

Author:

Yamamoto TakafumiORCID,Chikamatsu AkiraORCID,Kitagawa Shunsaku,Izumo Nana,Yamashita ShunsukeORCID,Takatsu Hiroshi,Ochi Masayuki,Maruyama Takahiro,Namba Morito,Sun WenhaoORCID,Nakashima Takahide,Takeiri FumitakaORCID,Fujii KotaroORCID,Yashima MasatomoORCID,Sugisawa Yuki,Sano Masahito,Hirose YasushiORCID,Sekiba Daiichiro,Brown Craig M.ORCID,Honda TakashiORCID,Ikeda KazutakaORCID,Otomo ToshiyaORCID,Kuroki Kazuhiko,Ishida Kenji,Mori TakaoORCID,Kimoto KojiORCID,Hasegawa Tetsuya,Kageyama HiroshiORCID

Abstract

AbstractPerovskite 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.

Funder

MEXT | JST | Core Research for Evolutional Science and Technology

Publisher

Springer Science and Business Media LLC

Subject

General Physics and Astronomy,General Biochemistry, Genetics and Molecular Biology,General Chemistry

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