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

Takafumi Yamamoto, Akira Chikamatsu, Shunsaku Kitagawa, Nana Izumo, Shunsuke Yamashita, Hiroshi Takatsu, Masayuki Ochi, Takahiro Maruyama, Morito Namba, Wenhao Sun, Takahide Nakashima, Fumitaka Takeiri, Kotaro Fujii, Masatomo Yashima, Yuki Sugisawa, Masahito Sano, Yasushi Hirose, Daiichiro Sekiba, Craig M. Brown, Takashi Honda, Kazutaka Ikeda, Toshiya Otomo, Kazuhiko Kuroki, Kenji Ishida, Takao Mori, Koji Kimoto, Tetsuya Hasegawa and Hiroshi Kageyama ()
Additional contact information
Takafumi Yamamoto: Graduate School of Engineering
Akira Chikamatsu: The University of Tokyo
Shunsaku Kitagawa: Kyoto University
Nana Izumo: Graduate School of Engineering
Shunsuke Yamashita: National Institute for Materials Science
Hiroshi Takatsu: Graduate School of Engineering
Masayuki Ochi: Osaka University
Takahiro Maruyama: The University of Tokyo
Morito Namba: Graduate School of Engineering
Wenhao Sun: University of Michigan
Takahide Nakashima: Graduate School of Engineering
Fumitaka Takeiri: Graduate School of Engineering
Kotaro Fujii: Tokyo Institute of Technology
Masatomo Yashima: Tokyo Institute of Technology
Yuki Sugisawa: University of Tsukuba
Masahito Sano: The University of Tokyo
Yasushi Hirose: The University of Tokyo
Daiichiro Sekiba: University of Tsukuba
Craig M. Brown: National Institute of Standards and Technology
Takashi Honda: High Energy Accelerator Research Organization (KEK)
Kazutaka Ikeda: High Energy Accelerator Research Organization (KEK)
Toshiya Otomo: High Energy Accelerator Research Organization (KEK)
Kazuhiko Kuroki: Osaka University
Kenji Ishida: Kyoto University
Takao Mori: National Institute for Materials Science
Koji Kimoto: National Institute for Materials Science
Tetsuya Hasegawa: The University of Tokyo
Hiroshi Kageyama: Graduate School of Engineering

Nature Communications, 2020, vol. 11, issue 1, 1-8

Abstract: Abstract 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.

Date: 2020
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DOI: 10.1038/s41467-020-19217-7

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