双面Tl-2223高温超导薄膜的制备研究
A new method for preparing double-sided Tl-2223 HTS films
赵海廷 1梁雪连 1陈纪煌 1杨骞 1季鲁 1何明1
作者信息
- 1. 南开大学电子信息与光学工程学院,天津 300350
- 折叠
摘要
本文提出了一种改进的两步法在2英寸LaAlO3(00l)衬底上制备双面Tl2Ba2Ca2Cu3O10(Tl-2223)高温超导薄膜,通过特制蓝宝石坩埚来控制Tl2O的挥发,避免了陪烧靶的使用.XRD测试结果显示薄膜中心处为Tl-2223超导相,随着薄膜向边缘延伸,Tl-2223相逐渐分解为Tl2Ba2Ca1Cu2O8(Tl-2212)相;薄膜反面也呈现相似的规律,但其Tl-2212相含量更高.SEM和AFM图像显示薄膜中心呈现层状结构,边缘呈现颗粒结构.测试结果表明该2英寸Tl-2223薄膜正反面的临界转变温度(Tc)为105 K与101 K,临界电流密度(Jc)平均都在1.0MA/cm2(77 K,0 T)左右.微波表面电阻(Rs)为0.16 mΩ与2.28 mΩ(77 K,10 GHz),且随温度升高而变大,符合二流体模型.
Abstract
An improved two-step method for the preparation of double-sided Tl2Ba2Ca2Cu3O10(Tl-2223)high-tem-perature superconducting films on 2-inch LaAlO3(00l)substrates was proposed.The volatilization of Tl2O can be controlled without the usage of additional Tl pellets by using a special sapphire crucible.XRD analysis verified the generation of the Tl-2223 phase in the middle of the obtained film.As the film extends towards the edge,the resultant Tl-2223 phase gradually de-composes into Tl2Ba2Ca1Cu2O8(Tl-2212)phase.The downside of the film also showes a similar pattern,but its content of Tl-2212 phase is higher.SEM and AFM images show that the center of the film shows a layered structure and the edges present the particle structure.The measurement results of the 2-inch Tl-2223 film show that the critical temperature(Tc)on the up-side and downside of the film is 105 K and 101 K,the averaged critical current density(Jc)on both sides is around 1.0 MA/cm2(77 K,0 T).The microwave surface resistance(Rs)on the upside and downside of the film is 0.16 mΩ and 2.28 mΩ(77 K,10 GHz)and increases with increasing temperature,which is consistent with the two-fluid model.
关键词
Tl-2223/高温超导薄膜/临界转变温度/临界电流密度/微波表面电阻Key words
Tl-2223/HTS films/Critical temperature/Critical current density/Microwave surface resistance引用本文复制引用
基金项目
国家自然科学基金(61771099)
国家自然科学基金(51002081)
国家自然科学基金(12074195)
出版年
2024
NETL
NSTL
万方数据