摘要
利用脉冲激光沉积法(PLD),在质量流量比为1∶3的氧气和氩气的混合气氛下,在STO(001)基片上制备了外延的YBa_2Cu_3O_(7-δ)(YBCO)超导薄膜。尽管薄膜表面分布有亚微米到微米量级颗粒,但与传统PLD制备YBCO的方法相比,大颗粒的密度要小得多。直流电阻和磁化率测量法同时证明了YBCO薄膜的超导转变温度(T_c)大于90 K。在40 K时,零场临界电流密度(J_c)为63.8 MA/cm^2,在5.2 T时达到最大钉扎力密度(F_(pmax))387.9 GN/m^3;在65 K时,零场Jc为28.3 MA/cm^2,在2.6 T时F_(pmax)达到71.3 GN/m^3;在77 K时,零场J_c为8.7 MA/cm^2,在0.91T时F_(pmax)达到12.1 GN/m^3。研究结果为氧气和氩气混合气氛下PLD方法制备YBCO薄膜提供了重要实验数据。
The YBa2Cu3O（7-δ）（ YBCO） superconducting film was fabricated epitaxially on STO（ 001）substrate by pulsed laser deposition method（ PLD） in O2/Ar mixture atmosphere with the mass flow rate ratio of 1：3. The density of the particles with submicron to micron-sized distributed on the film surface is lower compared with the YBCO film deposited by traditional PLD method. The supconducting transition temperature（ Tc） is above 90 K measured by DC resistance as well as the magnectic susceptibility. The zero field critical current density（ Jc） is 63. 8 MA/cm^2,28. 3 MA/cm^2 and 8. 7 MA/cm^2 at 40 K,65 K and 77 K,respectively. The flux pinning force density reaches the maximum of 387. 9 GN/m^3 at 5.2 T,71. 3 GN/m3 at 2. 6 T,and 12. 1 GN/m^3 at 0. 91 T at 40 K,65 K and 77 K,respectively. The experimental results provide valuable reference for further study of superconducting films deposited in Ar/O2 mixture atmosphere by PLD method.
出处
《人工晶体学报》
CSCD
北大核心
2017年第8期1464-1469,共6页
Journal of Synthetic Crystals
基金
国家自然科学基金(11374086)
河北省自然科学基金(E2014201188)
