Effect of substrate surface modification using Ag nano-dots on the improvement of J
c
and microstructures in YBa2Cu3O7 thin films grown on LaAlO3 (100) by pulsed laser deposition |
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| Authors: | A H Li X L Wang H K Liu M Ionescu S X Dou P Xuan E W Collings |
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| Affiliation: | (1) Institute for Superconducting and Electronic Materials, University of Wollongong, NSW, 2522, Australia;(2) Laboratories for Applied Superconductivity and Magnetism, Department of Materials Science and Engineering, The Ohio State University, 2041 College Road, Columbus, OH 43210-1179, USA |
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| Abstract: | YBa2Cu3O7 (Y123) thin films were grown by pulsed laser deposition (PLD) on LaAlO3 (100) substrates whose surfaces were modified by a discontinuously layer of Ag nano-dots. The Y123 films were characterised
by atomic force microscope, X-ray diffraction, scanning electron microscope, and DC magnetization measurements. Effect of
substrate surface modification using various densities of the Ag nano-dots on the improvements of critical current density
J
c
and microstructures in the Y123 films has been studied systematically. The results showed that at fixed physical deposition
conditions J
c
increased with the number of Ag shots, n. Zero field J
c
at 77 K increased from 106 to 3.3 × 106 A/cm2, and from 1.5 × 107up to 4 × 107A/cm2 for 5 K as the number of Ag shots increased from zero to 150. However, a fluctuation of J
c
was observed for n < 60 at 77 and 40 K in both low and high fields. Detailed microstructure analysis revealed that ab misalignment was gradually improved as Ag nano-dots density gradually increased and believed to be responsible for the J
c
enhancement. |
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| Keywords: | YBCO Thin films Substrate Microstructure Nano-dots Flux pinning Critical current density |
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