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The origin of the modulated structure in Sr 2 CuO 3+ δ ( δ = 0.4): [CuO 2 ] in‐plane oxygen vacancy or apical oxygen vacancy?
Author(s) -
Shen Xi,
Cao LiPeng,
Zhao JianFa,
Wang WeiPeng,
Liu QingQing,
Yao Yuan,
Li JunJie,
Gu ChangZhi,
Chen MingWei,
Jin ChangQing,
Yu RiCheng
Publication year - 2019
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.16662
Subject(s) - vacancy defect , oxygen , copper oxide , crystal structure , oxide , crystallography , superconductivity , octahedron , plane (geometry) , copper , crystal (programming language) , materials science , single crystal , high temperature superconductivity , phase (matter) , crystal chemistry , condensed matter physics , chemistry , inorganic chemistry , physics , metallurgy , geometry , mathematics , organic chemistry , computer science , programming language
We propose the question of the modulated structures of copper oxide is caused by the [CuO 2 ] in‐plane oxygen vacancy or apical oxygen vacancy. Sr 2 CuO 3+ δ single‐crystal samples were prepared using high‐temperature and high‐pressure methods. The major phase of Sr 2 CuO 3+ δ ( δ = 0.4) single‐crystal system is found to be constituted by the 5 2 a modulated structure with the Fmmm space group, which originates from the [CuO 2 ] in‐plane oxygen vacancy appearing in octahedral Cu‐O. Besides, the presence of the [CuO 2 ] in‐plane oxygen vacancy may obliterate the superconductivity of the system. Experimental results deduce that the oxygen vacancy may appear in the apical oxygen sites in high‐temperature copper oxide superconductors.