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Visualization of Dopant Oxygen Atoms in a Bi 2 Sr 2 CaCu 2 O 8+ δ Superconductor
Author(s) -
Song Dongsheng,
Zhang Xuefeng,
Lian Chaosheng,
Liu Hai,
Alexandrou Ioannis,
Lazić Ivan,
Bosch Eric G. T.,
Zhang Ding,
Wang LiLi,
Yu Rong,
Cheng Zhiying,
Song Canli,
Ma Xucun,
Duan Wenhui,
Xue Qikun,
Zhu Jing
Publication year - 2019
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201903843
Subject(s) - dopant , materials science , cuprate , superconductivity , oxygen , doping , condensed matter physics , high temperature superconductivity , electronic structure , chemical physics , crystallography , physics , optoelectronics , chemistry , quantum mechanics
A proper amount of excess oxygen plays a significant role in hole‐doped cuprate high‐ T c superconductivity. Here, the dopant oxygen in Bi 2 Sr 2 CaCu 2 O 8+ δ is directly imaged via integrated differential phase contrast combined with state‐of‐the‐art scanning transmission electron microscopy. The location of dopant oxygen is observed to be consistent with the position inferred from local strain analysis of the incommensurate structure. The influence of dopant oxygen on the local atomic lattice and electronic structure is further explored using first‐principle calculations. The dopant oxygen atoms not only aggravate the distortions of the local atomic arrangement but also alter the electronic states by transferring charge from the BiO planes to the CuO 2 planes. The underlying mechanism of charge transfer is resolved. The results may also be applicable to other oxygen‐doped cuprates with high‐ T c superconductivity.