| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Large grain size obtained by substrate directly heating for YBCO epitaxial films |
| Kebin Li(李珂彬), Yifei Zhang(张一飞), Tong Zhang(张同), Shuguang Yi(易曙光), Shi-Peng Zhang(张世鹏), Quan-Ming Gao(高全明), and Shan-Dong Li(李山东)† |
| Shandong Key Laboratory of Advanced Packaging, System Integration and Applications, College of Electronics and Information, Qingdao University, Qingdao 266071, China |
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Abstract It is very important for high temperature superconducting electronic devices to increase the grain size of YBCO epitaxial films because it can effectively reduce the defects and improve the probability of successful preparation of Josephson junction. In this study, YBa$_{2}$Cu$_{3}$O$_{7-\delta }$ (YBCO) films with grain size in excess of 1.5 μm were successfully prepared by the directly heating SrTiO$_3$ substrates coated by SiC on their back. Interestingly, the grain size of YBCO film is enhanced greatly by this directly heating method, and the critical temperature $T_{\rm C}$ and critical current density $J_{\rm C}$ of YBCO films are as high as 91.5 K and 3.5 MA/cm$^{2}$, respectively. Compared with the traditional indirect heating method, which involves applying silver paste and then using a heat soaking block ($e.g.$ Inconel 600), this direct heating method effectively enhances the grain size of YBCO film and the possibility of successful preparation of Josephson junction.
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Received: 28 February 2025
Revised: 22 April 2025
Accepted manuscript online: 07 May 2025
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PACS:
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74.25.-q
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(Properties of superconductors)
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74.25.Sv
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(Critical currents)
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74.78.-w
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(Superconducting films and low-dimensional structures)
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81.15.Fg
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(Pulsed laser ablation deposition)
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| Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2023YFF0720500), the State Key Program of the National Natural Science Foundation of China (Grant No. U22A2019), and the National Key Project (Grant No. 22-05-CXZX-04-03-15). |
Corresponding Authors:
Shan-Dong Li
E-mail: dylsd007@163.com
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Cite this article:
Kebin Li(李珂彬), Yifei Zhang(张一飞), Tong Zhang(张同), Shuguang Yi(易曙光), Shi-Peng Zhang(张世鹏), Quan-Ming Gao(高全明), and Shan-Dong Li(李山东) Large grain size obtained by substrate directly heating for YBCO epitaxial films 2025 Chin. Phys. B 34 097403
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