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Critical current and microstructure of uniaxially aligned, polycrystalline YBa2Cu3O7−δ

Published online by Cambridge University Press:  31 January 2011

J.E. Tkaczyk ,
C.L. Briant ,
J.A. DeLuca ,
E.L. Hall ,
P.L. Karas ,
K.W. Lay ,
E. Narumi  and
D.T. Shaw
J.E. Tkaczyk
Affiliation:
General Electric Corporate Research and Development Center, Schenectady, New York 12301
C.L. Briant
Affiliation:
General Electric Corporate Research and Development Center, Schenectady, New York 12301
J.A. DeLuca
Affiliation:
General Electric Corporate Research and Development Center, Schenectady, New York 12301
E.L. Hall
Affiliation:
General Electric Corporate Research and Development Center, Schenectady, New York 12301
P.L. Karas
Affiliation:
General Electric Corporate Research and Development Center, Schenectady, New York 12301
K.W. Lay
Affiliation:
General Electric Corporate Research and Development Center, Schenectady, New York 12301
E. Narumi
Affiliation:
State University of New York at Buffalo, Buffalo, New York 14260
D.T. Shaw
Affiliation:
State University of New York at Buffalo, Buffalo, New York 14260
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Abstract

Three processing routes that generate uniaxial alignment but otherwise yield very different microstructure and critical current are compared. Fine grain size and c-axis alignment are obtained in magnetically aligned ceramics, pyrolyzed thick films, and in situ deposited thin films. The dense, well-aligned microstructure of the in situ process produces the highest zero field critical current Jc > 104 A/cm2 at 77 K. However, the critical current is suppressed in low magnetic field, suggesting that uniaxial alignment is not sufficient to avoid Josephson-type intergranular coupling. Above 1 T, the critical current of the aligned ceramic dominates in spite of its less ideal microstructure. The critical current in this high field region is one to two orders of magnitude greater than that of nonaligned material. This result implies the existence of a 3-d percolative network of strong links.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 6 , June 1992 , pp. 1317 - 1327
Copyright
Copyright © Materials Research Society 1992

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