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ST336 - Interaction between BaZrO3 Nano-rods and RE2O3 Nano-dots and Its Effects on the Flux Pinning in Zr:REBCO Tapes

Interaction between BaZrO3 Nano-rods and RE2O3 Nano-dots
and Its Effects on the Flux Pinning in Zr:REBCO Tapes

Yimin Chen1, Changhui Lei1, Yao Yao2, Jingfu Liu2, Yuhao Liu2, Narayan Khatri2, Masayasu Kasahara2, Eduard Galstyan2, Tuo Shi2 and Venkat Selvamanickam2

1SuperPower Inc, 450 Duane Ave, Schenectady, NY 12304, USA
2Department of Mechanical Engineering and Texas Center for Superconductivity, University of Houston, TX 77204

Abstract - The effects of Zr content and rare-earth content on the micro-structural and superconducting properties of Zr:GdYBCO coated superconducting tapes were systematically studied. At a lower temperature, the Zr content required for optimum pinning increases. At a temperature below 40K and magnetic field of 3T, the Zr content for optimum pinning is 15% or higher. The effects of rare earth composition on the microstructure and superconducting properties were studied for 15% Zr-added (Gd,Y)BCO  superconducting tapes. It is found that the Gd+Y content of 1.2 is the optimized (Gd,Y) composition for the growth of long BZO nanorods. It is also the optimum (Gd,Y) content for the 15% Zr-added (Gd,Y)BCO achieving the best in-field performance. The Zr:(Gd,Y)BCO films with long BZO nanorods, exhibit better in-field performance at low temperature than the short nanorods. Long BZO nanorods growing through the entire thickness of the film were seen only in the (Gd,Y)1.2 tapes. The composition effects are more significant at low temperature than at 77K. In fact, the minimum critical current for all magnetic-field-angle at 30K and 3T, Ic(30K,3T), as a function of Gd+Y content showed a sharp peak at Gd+Y=1.2; while Ic(77K,1T) varies not much with the variation of Gd+Y in the range from 1.1 to 1.5.

Keywords - YBCO, Flux pinning, Coated conductor, MOCVD

IEEE/CSC & ESAS European Superconductivity News Forum (ESNF) No. 23  January 2013;  Categories 2, 5.
Invited presentation 4MJ-01 given at ASC 2012.