Significantly Improving the Flux Pinning of YBa2Cu3O7-δ Superconducting Coated Conductors via BaHfO3 Nanocrystal Addition Using Multistep Film Growth Method

被引:12
作者
Huang, Rongtie [1 ,2 ]
Chen, Jing [1 ,2 ,3 ]
Liu, Zhiyong [1 ,2 ]
Wang, Gang [3 ]
Cai, Chuanbing [1 ,2 ]
机构
[1] Shanghai Univ, Dept Phys, Shanghai Key Lab High Temp Supercond, Shanghai 200444, Peoples R China
[2] Shanghai Creat Supercond Technol Co Ltd, Shanghai 201401, Peoples R China
[3] Shanghai Univ, Inst Mat, Shanghai 200444, Peoples R China
基金
国家重点研发计划; 中国国家自然科学基金;
关键词
BaHfO3; nanocrystal; flux pinning; high temperature superconductor; multistep growth; YBa2Cu3O7-delta nanocomposite; NANOCOMPOSITES;
D O I
10.1002/adfm.202401251
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
A novel multistep film growth method is developed to prepare high-performance BaHfO3(BHO)-nanocrystal-added YBa2Cu3O7-delta(YBCO) tapes. Upscaled YBCO tapes with high concentrations of 6.2 nm BHO nanocrystals exhibit better self-field and in-field performances when grown by the multistep method compared to those grown by the traditional method. The in-field critical current (I-c) of the 1.6-mu m-thick BHO-added YBCO film at 30 K@3 T is enhanced by 50% in the optimal traditional cases, whereas it is further increased to 180% using a multistep growth strategy. The high-performance YBCO layer is thickened to 2.3 mu m using the multistep method, and the improvement of in-field I-c at 30 K@3 T is enhanced by 215% to 360 A per 4 mm-width compared to the pristine. The BHO size evolution during the high-temperature process reveals that the added nanocrystals coarsened by 4 to 10.5 nm in both the traditional and multistep cases, thereby indicating that the further improvement in performance is attributed to the better film quality grown by the multistep method. This technique can be applied directly to the preparation of scaled REBCO tapes with a length of hundreds of meters.
引用
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页数:9
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