Pinning Characteristics of Zr and Hf- Added REBCO Coated Conductors Made by Advanced MOCVD in Low-to-High Magnetic Fields

BaMO 3 (M = Zr, Hf) pinning centers introduced in REBa 2 Cu 3 O 7-x (REBCO and RE = rare earth) coated conductors yield superior performance in high magnetic fields. We present the critical current density J c over a temperature range of 4.2-77 K and magnetic fields of 0-14 T ( B || c- axis), of 5-1...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2021-08, Vol.31 (5), p.1-5
Main Authors: Galstyan, Eduard, Pratap, Rudra, Paidpilli, Mahesh, Majkic, Goran, Selvamanickam, Venkat
Format: Article
Language:English
Subjects:
2G high-temperature superconductor (2G-HTS)
Barium
Conductors
Copper
Correlation analysis
Critical current density
Critical current density (superconductivity)
Hafnium
Magnetic fields
metal organic chemical vapor deposition (MOCVD)
Metalorganic chemical vapor deposition
Microstructure
Morphology
Nanorods
Organic chemicals
Organic chemistry
Pinning
Self-assembly
transmission electron microscopy (TEM)
Zirconium
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Summary:BaMO 3 (M = Zr, Hf) pinning centers introduced in REBa 2 Cu 3 O 7-x (REBCO and RE = rare earth) coated conductors yield superior performance in high magnetic fields. We present the critical current density J c over a temperature range of 4.2-77 K and magnetic fields of 0-14 T ( B || c- axis), of 5-15 mol.% Zr- and Hf- added REBCO 4+ μm thick film tapes fabricated by advanced metal organic chemical vapor deposition (A-MOCVD). The morphology of self-assembled BMO nanorods aligned along c-axis is found to be dependent on the Zr/Hf content. We also observe a correlation between the density of RE 2 O 3 in-plane nanoprecipitates and the continuity and concentration of BMO nanorods in films of different Ba content. It is found that the (Ba + M)/Cu (M = Zr, Hf) content in REBa 2 Cu 3 O 7-x affects the shape of pinning force density curves over a wide magnetic field range and temperatures below 20 K. Another remarkable observation is the similarity in the critical current properties of Hf and Zr- added REBCO films as function of (Ba + M)/Cu content at intermediate to high range of (Ba + M)/Cu content. A quantitative analysis of pinning efficiency and correlation with the microstructure of Zr and Hf- added REBCO coated conductors is discussed.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2021.3061904