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Grain Boundary Weak Links in High-TC Superconductors

Published online by Cambridge University Press:  26 February 2011

Donglu Shi,
S. Sengupta,
K. C. Goretta,
S. Salem-Sugui Jr,
M. Smith and
Y. N. Lwin
Donglu Shi
Affiliation:
Argonne National Laboratory, Argonne, IL 60439
S. Sengupta
Affiliation:
Argonne National Laboratory, Argonne, IL 60439
K. C. Goretta
Affiliation:
Argonne National Laboratory, Argonne, IL 60439
S. Salem-Sugui Jr
Affiliation:
Argonne National Laboratory, Argonne, IL 60439
M. Smith
Affiliation:
Department of Physics, Western Illinois University, Macomb, IL 61455
Y. N. Lwin
Affiliation:
Department of Physics, Western Illinois University, Macomb, IL 61455
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Abstract

The transport critical current density (Jc) for high-Tc thin films, bicrystals, and bulk ceramics is shown to be determined by magnetic field penetration into the grain boundaries. The gross grain orientations may not in all cases be an important factor in determining this penetration. The parameter (λG/λj)2can characterize the strength of the grain boundary coupling, which depends mainly on the crystal coherence and connectivity at the boundary area.

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References

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