Large grain size obtained by substrate directly heating for YBCO epitaxial films

doi:10.1088/1674-1056/add4fc

中国物理B ›› 2025, Vol. 34 ›› Issue (9): 97403-097403.doi: 10.1088/1674-1056/add4fc

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

收稿日期:2025-02-28 修回日期:2025-04-22 接受日期:2025-05-07 出版日期:2025-08-21 发布日期:2025-09-09
通讯作者: Shan-Dong Li E-mail:dylsd007@163.com
基金资助:
YBCO film|grain size|critical temperature|critical current density

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

Received:2025-02-28 Revised:2025-04-22 Accepted:2025-05-07 Online:2025-08-21 Published:2025-09-09
Contact: Shan-Dong Li E-mail:dylsd007@163.com
Supported by:
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).

摘要/Abstract

摘要： 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.

关键词: YBCO film, grain size, critical temperature, critical current density

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.

Key words: YBCO film, grain size, critical temperature, critical current density

中图分类号: (Properties of superconductors)

74.25.-q

74.25.Sv (Critical currents) 74.78.-w (Superconducting films and low-dimensional structures) 81.15.Fg (Pulsed laser ablation deposition)

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[J]. 中国物理B, 2025, 34(9): 97403-097403.

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Large grain size obtained by substrate directly heating for YBCO epitaxial films

Large grain size obtained by substrate directly heating for YBCO epitaxial films

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