Effects of YSZ Buffer Layer Surface Morphology on Superconducting Performance of YBCO films Deposited by Pulsed Laser Deposition on NiW Tapes

11th European Conference on Applied Superconductivity

Xiao, G.N.^1 ; Liu, L.F.^1 ; Xu, D.^1 ; Wu, X.^1 ; Luo, Q.^1 ; Li, Y.J.^1

Department of Physics and Astronomy, Key Laboratory of Artificial Structures and Quantum Control, Shanghai Jiao Tong University, Shanghai

200240, China^1

关键词: Biaxially textured;    Critical current density Jc;    Deposition Parameters;    Experimental conditions;    Laser repetition rate;    Superconducting layer;    Superconducting performance;    Superconducting transport properties;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/507/2/022046/pdf
DOI  :  10.1088/1742-6596/507/2/022046

来源: IOP

【 摘 要 】

YSZ buffer layers and YBCO superconducting layers were grown on biaxially textured NiW tapes by a reel-to-reel pulsed laser deposition (PLD) technique. It was found that orientation and surface morphology of YSZ buffer layers were very sensitive to deposition parameters, especially to oxygen pressure and laser repetition rate. Relationships between microstructure, surface morphology of YSZ buffer layer and PLD deposition parameters were systematically studied using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The effects of surface morphology of YSZ buffer layer on the superconducting performance of YBCO layer were investigated. As increasing oxygen pressure from 0.5 to 10 mTorr, the surface morphology of YSZ buffer layer became better first and then worse, however, it deteriorated with the increase of laser repetition rate. It was found that the surface morphology of YSZ buffer layer had great influence on the superconducting transport properties of YBCO layer. Under optimized experimental condition, high quality YBCO layer with critical current density Jcabove 4 × 106A/cm2was obtained at 77 K and self field.