【公開日：2023.08.01】【最終更新日：2023.05.18】
課題データ / Project Data
課題番号 / Project Issue Number
22JI0053
利用課題名 / Title
Observation of atomic arrangement at the heterojunction interface of high temperature superconductor heterostructures
利用した実施機関 / Support Institute
北陸先端科学技術大学院大学 / JAIST
機関外・機関内の利用 / External or Internal Use
外部利用/External Use
技術領域 / Technology Area
【横断技術領域 / Cross-Technology Area】（主 / Main）計測・分析/Advanced Characterization（副 / Sub）-
【重要技術領域 / Important Technology Area】（主 / Main）高度なデバイス機能の発現を可能とするマテリアル/Materials allowing high-level device functions to be performed（副 / Sub）量子・電子制御により革新的な機能を発現するマテリアル/Materials using quantum and electronic control to perform innovative functions
キーワード / Keywords
Superconducting materials, Thin films,電子顕微鏡/Electron microscopy,高品質プロセス材料,量子効果デバイス,表面・界面・粒界制御
利用者と利用形態 / User and Support Type
利用者名（課題申請者）/ User Name (Project Applicant)
Jiqiang Jia
所属名 / Affiliation
Advanced Analysis and Testing Center, Xi'An University of Technology
共同利用者氏名 / Names of Collaborators in Other Institutes Than Hub and Spoke Institutes
ARIM実施機関支援担当者 / Names of Collaborators in The Hub and Spoke Institutes
Yoshifumi Oshima
利用形態 / Support Type
（主 / Main）技術補助/Technical Assistance（副 / Sub）,機器利用/Equipment Utilization
利用した主な設備 / Equipment Used in This Project
報告書データ / Report
概要（目的・用途・実施内容）/ Abstract (Aim, Use Applications and Contents)
The purpose of this project is to study the influence of the growth characteristics and interface arrangement of atoms on the electromagnetism properties of heterostructures formed by two different superconductors. In the experiment, YBa2Cu3O7-δ/Nd1.85Ce0.15CuO4 (YBCO/NCCO) hetero-structure grown on SrTiO3 (STO) substrate was observed using the spherical aberration corrected transmission electron microscope (JEM-ARM200F). The atomic arrangement and material growth orientation at the YBCO/NCCO and NCCO/STO interfaces were studied, and the bright field and high-angle annular dark field images of the above interfaces were obtained.
実験 / Experimental
Observing the interface atomic arrangement characteristics of YBa2Cu3O7-δ/Nd1.85Ce0.15CuO4 heterostructure using the STEM mode of ARM200 (Applied voltage is 200kV).
結果と考察 / Results and Discussion
The two-dimensional atomic images of the interface of YBa2Cu3O7-δ/Nd1.85Ce0.15CuO4/SrTiO3 (YBCO/NCCO/STO) heterostructure (Figs. 1 (a) and (b)) were obtained using the STEM mode of JEM-ARM 200F. The YBCO/NCCO heterostructure is epitaxially grown on STO (001) plane in the (001) direction. The first epitaxial layers of NCCO and YBCO are found to be both Cu-O layers (as shown in Figs. 1 (b) and (c)). In addition, a distortion layer of double Cu-O plane was observed at the YBCO/NCCO interface (as shown in the ① region in Fig. 1 (b)). It is believed that the formation of the distorted layer may be the result of interface stress. These experimental results provide a valuable information on understanding the electron transport characteristics at the interface of double-layer superconductor heterostructures.
図・表・数式 / Figures, Tables and Equations
Fig.1 Atom-resolved annular dark field STEM images of YBCO/NCCO/STO (a) NCCO/STO interface; (b) YBCO/NCCO interface
その他・特記事項（参考文献・謝辞等） / Remarks(References and Acknowledgements)
成果発表・成果利用 / Publication and Patents
論文・プロシーディング（DOIのあるもの） / DOI (Publication and Proceedings)
口頭発表、ポスター発表および、その他の論文 / Oral Presentations etc.
特許 / Patents
特許出願件数 / Number of Patent Applications：0件
特許登録件数 / Number of Registered Patents：0件