Magneto-optical imaging of transport currents in YBa/sub 2/Cu/sub 3/O/sub 7-x/ on RABiTS/sup TM

Authors :: A. A. Polyanskii
D. C. Larbalestier
J.L. Reeves
Ron Feenstra
D. M. Kroeger
Mariappan Parans Paranthaman
Amit Goyal
Dominic F. Lee
David K. Christen
Susan E. Babcock
D.M. Feldmann
Source :: IEEE Transactions on Appiled Superconductivity. 11:3772-3775
Publication Year :: 2001
Publisher :: Institute of Electrical and Electronics Engineers (IEEE), 2001.
Abstract: Two YBa/sub 2/Cu/sub 3/O/sub 7-x/ (YBCO) on RABiTS/sup TM/ conductors with high J/sub c/ (0 T, 77 K) values of 2.3 and 2.4 MA/cm/sup 2/ were scribed by laser cutting to constrict supercurrent flow. On one of these tracks, magneto-optical (MO) imaging of the self-field produced by a transport current directly demonstrates the percolative nature of the current flow. Using backscattered electron Kikuchi pattern (BEKP) analysis, we have found that Ni grain boundaries (GBs)>5/spl deg/ generally introduce GBs in the YBCO that have lower J/sub c/ values than the intra-grain.

Subjects :: High-temperature superconductivity
Materials science
Condensed matter physics
Supercurrent
Backscattered electron
Condensed Matter Physics
Electronic, Optical and Magnetic Materials
law.invention
Magneto optical
Electron diffraction
law
Grain boundary
Electrical and Electronic Engineering
Kikuchi line
Electrical conductor

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