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Local measurement of current density by magneto-optical current reconstruction in normally and overpressure processed Bi-2223 tapes

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9 Author(s)
S. Patnaik ; Sch. of Phys. Sci., Jawaharlal Nehru Univ., New Delhi, India ; D. M. Feldmann ; A. A. Polyanskii ; Y. Yuan
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Magneto-optical current reconstruction has been used for detailed analysis of the local critical current density (Jc) variation in monocore Bi-2223 tapes. We find, even in high quality tapes with bulk transport jc∼40 kA/cm2 (77 K, 0 T), that there exist local regions which possess current densities of more than 200 kA/cm2. Overpressure processing at 148 bar significantly improved Jc to 48 kA/cm2 by improving the connectivity. For the overpressure-processed sample we find that the current distribution is more uniform and that the maximum local current density at 77 K is increased almost to 300 kA/cm2.

Published in:

IEEE Transactions on Applied Superconductivity  (Volume:13 ,  Issue: 2 )