Visualizing extended defects at the atomic level in a Bi2Sr2CaCu2O8+δ superconducting wire

doi:10.1088/1674-1056/ad6ccd

中国物理B ›› 2024, Vol. 33 ›› Issue (9): 96101-096101.doi: 10.1088/1674-1056/ad6ccd

所属专题： SPECIAL TOPIC — Stephen J. Pennycook: A research life in atomic-resolution STEM and EELS

Visualizing extended defects at the atomic level in a Bi₂Sr₂CaCu₂O_8+δ superconducting wire

Kejun Hu(胡柯钧), Shuai Wang(王帅), Boyu Li(李泊玉), Ying Liu(刘影)†, Binghui Ge(葛炳辉), and Dongsheng Song(宋东升)‡

Information Materials and Intelligent Sensing Laboratory of Anhui Province, Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education, Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, China

收稿日期:2024-06-03 修回日期:2024-08-06 接受日期:2024-08-08 发布日期:2024-08-30
通讯作者: Ying Liu, Dongsheng Song E-mail:liuying.hube@outlook.com;dsong@ahu.eud.cn

Visualizing extended defects at the atomic level in a Bi₂Sr₂CaCu₂O_8+δ superconducting wire

Kejun Hu(胡柯钧), Shuai Wang(王帅), Boyu Li(李泊玉), Ying Liu(刘影)†, Binghui Ge(葛炳辉), and Dongsheng Song(宋东升)‡

Information Materials and Intelligent Sensing Laboratory of Anhui Province, Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education, Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, China

Received:2024-06-03 Revised:2024-08-06 Accepted:2024-08-08 Published:2024-08-30
Contact: Ying Liu, Dongsheng Song E-mail:liuying.hube@outlook.com;dsong@ahu.eud.cn

摘要/Abstract

摘要： The microstructure significantly influences the superconducting properties. Herein, the defect structures and atomic arrangements in high-temperature Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8+\delta }$ (Bi-2212) superconducting wire are directly characterized via state-of-the-art scanning transmission electron microscopy. Interstitial oxygen atoms are observed in both the charge reservoir layers and grain boundaries in the doped superconductor. Inclusion phases with varied numbers of CuO$_{2}$ layers are found, and twist interfaces with different angles are identified. This study provides insights into the structures of Bi-2212 wire and lays the groundwork for guiding the design of microstructures and optimizing the production methods to enhance superconducting performance.

关键词: superconductor, microstructure, defect, scanning transmission electron microscopy

Abstract: The microstructure significantly influences the superconducting properties. Herein, the defect structures and atomic arrangements in high-temperature Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8+\delta }$ (Bi-2212) superconducting wire are directly characterized via state-of-the-art scanning transmission electron microscopy. Interstitial oxygen atoms are observed in both the charge reservoir layers and grain boundaries in the doped superconductor. Inclusion phases with varied numbers of CuO$_{2}$ layers are found, and twist interfaces with different angles are identified. This study provides insights into the structures of Bi-2212 wire and lays the groundwork for guiding the design of microstructures and optimizing the production methods to enhance superconducting performance.

Key words: superconductor, microstructure, defect, scanning transmission electron microscopy

中图分类号: (Techniques for structure determination)

61.05.-a

61.72.-y (Defects and impurities in crystals; microstructure) 74.62.Dh (Effects of crystal defects, doping and substitution) 84.71.Mn (Superconducting wires, fibers, and tapes)

Kejun Hu(胡柯钧), Shuai Wang(王帅), Boyu Li(李泊玉), Ying Liu(刘影), Binghui Ge(葛炳辉), and Dongsheng Song(宋东升). Visualizing extended defects at the atomic level in a Bi₂Sr₂CaCu₂O_8+δ superconducting wire[J]. 中国物理B, 2024, 33(9): 96101-096101.

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Visualizing extended defects at the atomic level in a Bi₂Sr₂CaCu₂O_8+δ superconducting wire

Visualizing extended defects at the atomic level in a Bi₂Sr₂CaCu₂O_8+δ superconducting wire

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