1. Deposition of REBCO with different rare earth elements on CeO2 buffered technical substrates by fluorine-free metal organic decomposition route
- Author
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Jiamin Zhu, Yue Zhao, Jiangtao Shi, Zhijian Jin, Xin Yu, Wei Wu, Yue Wu, Guangyu Jiang, Yusong Gao, and Xueling Quan
- Subjects
010302 applied physics ,Superconductivity ,Materials science ,Condensed matter physics ,02 engineering and technology ,021001 nanoscience & nanotechnology ,Microstructure ,01 natural sciences ,Metal ,Crystallinity ,Phase (matter) ,visual_art ,0103 physical sciences ,Materials Chemistry ,Ceramics and Composites ,visual_art.visual_art_medium ,Texture (crystalline) ,0210 nano-technology ,Pinning force ,Deposition (law) - Abstract
Pristine REBa2Cu3O7−δ (REBCO, RE with Yb, Y, Dy, Gd, Eu and Sm) superconducting films are deposited on CeO2 buffered technical substrates by fluorine-free metal organic decomposition (FF-MOD) method. The structure and superconductivity are comprehensively characterized and studied. Under the optimal conditions, all the films form good crystallinity and strong biaxial texture examined by XRD. A smooth and dense morphology is observed in the YBCO, GdBCO, EuBCO and SmBCO films. For all the films, Tconset values are lower than that in the corresponding bulk materials, implying a certain degree of microstructure defects (e.g., RE-Ba substitution, and/or oxygen vacancies). Among all the compositions, the GdBCO film shows a high Tconset value (>90 K), while the high Jc values are achieved at 77 K in broad field regime, also being with the largest maximum pinning force of 2.3 GN m−3. On the other hand, a high Jc value (at 77 K self-field) is obtained in the YBCO film, however, the rapid Jc decay with increase of the magnetic fields is found. These results reveal that defects in the YBCO film could only serve as weak pinning centers at least at 77 K. According to Dew-Hughes fitting models, we found that the primary pinning mechanism in all the REBCO films attributes to typical 2D non-superconducting phase i.e., Normal surface pinning. This work for the first time systemically demonstrates feasibility of deposition REBCO with various rare earth elements on technical substrates through the FF-MOD route, and provides a guideline for further growth of nano-composited and mixed rare earth REBCO films.
- Published
- 2021