Tl-1223高温超导薄膜在蓝宝石单晶基片上的生长和性能研究

人工晶体学报 ›› 2023, Vol. 52 ›› Issue (4): 629-635.

Tl-1223高温超导薄膜在蓝宝石单晶基片上的生长和性能研究

韩徐¹, 金艳营¹, 曾立¹, 岳宏卫², 蒋艳玲¹, 唐平英¹, 黄国华¹, 谢清连¹

1.南宁师范大学,广西高校新型电功能材料重点实验室,南宁 530100;
2.桂林电子科技大学信息与通信学院,桂林 541004

收稿日期:2023-01-03 出版日期:2023-04-15 发布日期:2023-04-28
通信作者: 谢清连,博士,教授。E-mail:xieqingl2002@126.com
作者简介:韩徐(1997—),男,河南省人,硕士研究生。E-mail:hanxu@nnnu.edu.cn
基金资助:
国家自然科学基金(51962025,12064003);广西自然科学基金(2018GXNSFAA138195,2021JJA170081)

Growth and Properties of Tl-1223 High Temperature Superconducting Films on Sapphire Single Crystal Substrates

HAN Xu¹, JIN Yanying¹, ZENG Li¹, YUE Hongwei², JIANG Yanling¹, TANG Pingying¹, HUANG Guohua¹, XIE Qinglian¹

1. Key Laboratory of New Electric Functional Materials in Guangxi Universities, Nanning Normal University, Nanning 530100, China;
2. School of Information and Communication, Guilin University of Electronic Technology, Guilin 541004, China

Received:2023-01-03 Online:2023-04-15 Published:2023-04-28

摘要/Abstract

摘要： 本文报道了采用射频磁控溅射法和快速升温烧结法在R面取向的蓝宝石单晶基片上生长CeO₂缓冲层和Tl-1223超导薄膜,研究了缓冲层生长情况和先驱膜后退火条件对超导薄膜结晶情况和超导特性的影响。AFM和XRD表征结果显示,蓝宝石基片经过退火后其表面形成具有光滑平台的台阶结构,同时基片的晶体质量得到了改善;本文所制备的CeO₂缓冲层和Tl-1223超导薄膜具有较好的c轴生长取向,而且两者呈现良好的ab面内织构。SEM表征结果显示,生长良好的Tl-1223超导薄膜呈层状结构,表面光滑平整、结构致密。在液氮环境下,测得所制备Tl-1223超导薄膜的临界转变温度T_c约为111 K,临界电流密度J_c(77 K,0 T)约为1.3 MA/cm²。

关键词: Tl-1223超导薄膜, 快速升温烧结法, 蓝宝石基片, CeO₂缓冲层, 磁控溅射, 临界转变温度

Abstract: In this paper, the R-cut sapphire single crystal substrates were selected, and the CeO₂ buffer layers were grown on the surfaces of substrates by RF magnetron sputtering method, then the high quality Tl-1223 superconducting films were grown by the rapid heating-up sintering technology. The effects of buffer layer growth and post annealing conditions of the precursor films on the crystallization and superconducting properties of the superconducting thin films were studied. AFM and XRD measurements show that the surface of sapphire substrates have a step structure with smooth platform and the crystal quality of sapphire substrates have been improved after annealing; the CeO₂ buffer layers and the Tl-1223 superconducting films all have good c-axis growth orientation under appropriate parameters, and they exist a good ab-plane texture. SEM measurements show that the well grown Tl-1223 superconducting films have a layered structure and their surfaces are dense and smooth. The T_c of the prepared superconducting film is measured to be about 111 K, and J_c (77 K, 0 T) is measured to be about 1.3 MA/cm² in liquid nitrogen environment.

Key words: Tl-1223 superconducting film, rapid heating-up sintering method, sapphire substrate, CeO₂ buffer layer, magnetron sputtering, critical transition temperature

中图分类号:

O511.3

韩徐, 金艳营, 曾立, 岳宏卫, 蒋艳玲, 唐平英, 黄国华, 谢清连. Tl-1223高温超导薄膜在蓝宝石单晶基片上的生长和性能研究[J]. 人工晶体学报, 2023, 52(4): 629-635.

HAN Xu, JIN Yanying, ZENG Li, YUE Hongwei, JIANG Yanling, TANG Pingying, HUANG Guohua, XIE Qinglian. Growth and Properties of Tl-1223 High Temperature Superconducting Films on Sapphire Single Crystal Substrates[J]. Journal of Synthetic Crystals, 2023, 52(4): 629-635.

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