NDLI: Composition Effects on the Critical Current of MOCVD-Processed Zr:GdYBCO Coated Conductors in an Applied Magnetic Field

Content Provider	IEEE Xplore Digital Library
Author	Yimin Chen Tuo Shi Guevara, A.P. Yangxin Zhang Yao Yao Kesgin, I. Selvamanickam, V.
Copyright Year	2002
Abstract	Zr:GdYBCO films were grown by reel-to-reel metal organic chemical vapor deposition (MOCVD) on hastelloy tapes with IBAD-MgO-based buffer. The composition was varied systematically to investigate the effects of changes in (Gd+Y)/Ba, (Gd+Y)/Cu and Gd/Y ratios and Zr-doping concentration on the critical current density (J_c) of the films in an applied magnetic field (B). The magnetic-field-angle dependence of J_c measured at 77 K and 1 T showed that (1) for Gd+Y content ranging from 1.2 to 1.5, the minimum J_c for any angle did not vary significantly with the Gd+Y content; while the J_c at B//c varied significantly and took its maximum value at Gd+Y content of 1.2; (2) increasing Gd+Y could suppress or level off the J_c peak at B//c which was associated with the pinning from BaZrO₃ nano-columns; (3) the optimum Zr-concentration for the highest J_c(77 K, 1 T) is in the range of 0.04-0.07 in the film; in this range under certain growth condition, the c-peak in the angular dependence of J_c could be higher than the ab-peak; (4) increasing Gd/Y ratio increased J_{c_min}(77 K, 1 T); (5) in self-field or low field, however, the optimized Gd/Y ratio was about 1.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	3166
Ending Page	3170
Page Count	5
File Size	901963
File Format	PDF
ISSN	10518223
Volume Number	21
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	MOCVD Yttrium barium copper oxide Copper Superconducting magnets Conductors Barium Critical current 2G HTS Coated conductor composition effects YBCO
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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