TITLE

Artificial flux pinning centers in large, single-grain (RE)-Ba-Cu-O superconductors

AUTHOR(S)
Babu, N. Hari; Reddy, E. S.; Cardwell, D. A.; Campbell, A. M.; Tarrant, C. D.; Schneider, K. R.
PUB. DATE
December 2003
SOURCE
Applied Physics Letters;12/8/2003, Vol. 83 Issue 23, p4806
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Second-phase, nanoscale inclusions of composition Y[sub 2]Ba[sub 4]CuMO[sub y] (M=U, Nb, Ta, W, Mo, and Re), which form artificial pinning centers, have been introduced into large, single-grain [rare-earth (RE)]-Ba-Cu-O superconductors. A significant improvement in critical current density is observed in these samples, due presumably to various combinations of normal conducting, paramagnetic, and geometrical properties of the Y[sub 2]Ba[sub 4]CuMO[sub y] particles in the superconducting (RE)Ba[sub 2]Cu[sub 3]O[sub 7-δ] (RE-123) phase matrix. These Y[sub 2]Ba[sub 4]CuMO[sub y] phase particles are chemically stable in the Ba-Cu-O liquid during peritectic solidification, unlike Y[sub 2]BaCuO[sub 5] (Y-211) phase particles in Y-Ba-Cu-O, which opens a processing window for the fabrication of nanostructured large, single-grain (RE)-Ba-Cu-O superconductors with enhanced flux pinning for high-field engineering applications. © 2003 American Institute of Physics.
ACCESSION #
11567904

 

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