@article{44449df29e7a46088e2a72d242775541,
title = "Possible ferroelectricity in perovskite oxynitride SrTaO2N epitaxial thin films",
abstract = "Compressively strained SrTaO2N thin films were epitaxially grown on SrTiO3 substrates using nitrogen plasma-assisted pulsed laser deposition. Piezoresponse force microscopy measurements revealed small domains (101 - 102 nm) that exhibited classical ferroelectricity, a behaviour not previously observed in perovskite oxynitrides. The surrounding matrix region exhibited relaxor ferroelectric-like behaviour, with remanent polarisation invoked by domain poling. First-principles calculations suggested that the small domains and the surrounding matrix had trans-type and a cis-type anion arrangements, respectively. These experiments demonstrate the promise of tailoring the functionality of perovskite oxynitrides by modifying the anion arrangements by using epitaxial strain.",
author = "Daichi Oka and Yasushi Hirose and Hideyuki Kamisaka and Tomoteru Fukumura and Kimikazu Sasa and Satoshi Ishii and Hiroyuki Matsuzaki and Yukio Sato and Yuichi Ikuhara and Tetsuya Hasegawa",
note = "Funding Information: We thank Mr. Seiji Ito, Mr. Akira Morita, and Prof. Katsuyuki Fukutani of the University of Tokyo and Dr. Daiichiro Sekiba of the University of Tsukuba for their assistance in the setup of the NRA measurements. We also appreciate Dr. Hitoshi Morioka of Bruker AXS for his assistance in the high-temperature XRD measurements. This study was supported by the Ministry of Education, Culture, Sports, Science, and Technology (MEXT), Japan as part of KAKENHI No. 24760005 and the Japan Society for the Promotion of Science (JSPS) KAKENHI, Grant Number No. 248258. A part of this work was conducted in Research Hub for Advanced Nano Characterization, The University of Tokyo, under the support of {\textquoteleft}{\textquoteleft}Nanotechnology Platform{\textquoteright}{\textquoteright} (project No.12024046) by MEXT, Japan.",
year = "2014",
month = may,
day = "16",
doi = "10.1038/srep04987",
language = "English",
volume = "4",
journal = "Scientific Reports",
issn = "2045-2322",
publisher = "Nature Publishing Group",
}