Growth of simplified buffer template on flexible metallic substrates for YBa2Cu3O7-δ coated conductors

JOURNAL OF ALLOYS AND COMPOUNDS

卷:673

Article

Xue, Yan¹  Zhang, Ya-Hui¹  Zhang, Fei¹  Zhao, Rui-Peng¹  Wang, Hui²  Xiong, Jie¹  Tao, Bo-Wan¹ 

[1] Univ Elect Sci & Technol China, State Key Lab Elect Thin Film & Integrated Device, Chengdu 610054, Peoples R China

[2] Chinese Acad Sci, Inst Elect Engn, Appl Res Lab Superconduct & New Mat, Beijing 100190, Peoples R China

关键词: Coated conductors;    Simplified buffer structure;    Ion-beam-assisted deposition;    Biaxial texture;   

DOI  :  10.1016/j.jallcom.2016.02.175

来源: Elsevier

【 摘 要 】

A much simplified buffer structure, including a three-layer stack of LaMnO3/MgO/composite Y2O3-Al2O3, was proposed for high performance YBa2Cu3O7-delta (YBCO) coated conductors. In this structure, biaxially textured MgO films were prepared on solution deposition planarized amorphous substrate through ion-beam-assisted deposition (IBAD) technology. By the use of in situ reflection high-energy electron diffraction monitor, X-ray diffraction and atomic force microscope, the influence of deposition parameters, such as film deposition rate, ion penetrate energy and ion beam flux, on crystalline orientation, texture, lattice parameter and surface morphology was systematically investigated. Moreover, stopping and range of ion in mater simulation was performed to study the effects of ion bombardment on MgO films. By optimizing IBAD process parameters, the best biaxial texture showed omega-scan of (002) MgO and Phi-scan of (220) MgO yield full width at half maximum values of 2.4 degrees and 3.7 degrees, indicating excellent biaxial texture. Subsequently, LaMnO3 films were directly deposited on the IBAD-MgO template to improve the lattice mismatch between MgO and YBCO. Finally, YBCO films grown on this simplified buffer template exhibited a critical current density of 2.4 MA/cm(2) at 77 K and self-field, demonstrating the feasibility of this buffer structure. (C) 2016 Elsevier B.V. All rights reserved.

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