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Critical Current Densities JC(H,T) and Current-Voltage Characteristics in Melt Processed Bi-2212 with and without Preferential Orientation

Published online by Cambridge University Press:  26 February 2011

W. Paul ,
B. Heeb ,
Th. Baumann ,
M. Guidolin  and
L. J. Gauckler
W. Paul
Affiliation:
ABB Corporate Research, CH-5405 Baden, Switzerland
B. Heeb
Affiliation:
ETHZ, Nichtmetallische Werkstoffe, CH-8092 Zürich, Switzerland
Th. Baumann
Affiliation:
ABB Corporate Research, CH-5405 Baden, Switzerland
M. Guidolin
Affiliation:
ABB Corporate Research, CH-5405 Baden, Switzerland
L. J. Gauckler
Affiliation:
ETHZ, Nichtmetallische Werkstoffe, CH-8092 Zürich, Switzerland
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Abstract

In contrast to sintered Bi2Sr2Ca1Cu2Oy (Bi-2212), melt processed material exhibits nonzero intergrain supercurrents at T < 77 K. By means of partial melting and long term annealing we achieved nonoriertted material with Jc(77) - 3500 A/cm2 (1μV/cm criterion) and Tc = 96 K. Zone melting leads to well textured bulk material with the c-axis of the crystallites oriented perpendicular to the pulling direction R, and thus to an anisotropie critical current density. The anisotropy factor is between 2 and 5. At low temperatures the melt textured ceramic exhibits higher critical currents than the nonoriented material. This is not true at high temperatures, since the latter has a higher critical temperature.

At 77 K and small fields both oriented and nonoriented ceramics exhibit no transition in their current-voltage characteristics, but obey the power law E = Eo(j/jo(H)) α(H) over a large range in E (10”−3-10”−3 V/cm). Measurements on the textured ceramic with magnetic fields parallel and perpendicular to the pulling direction demonstrate that the superconducting properties of these materials are only affected by the field components parallel to the c-axes of the crystallites. For fields parallel to the pulling direction the measured values of α(H), Jo(H) and of the reversible magnetization Mrev can be attributed to the misorientation of the Bi-2212 platelets which is in average about 14°.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 275: Symposium S – Layered Superconductors: Fabrication, Properties and Applications , 1992 , 383
Copyright
Copyright © Materials Research Society 1992

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References

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