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Grain Boundary Modelling and Correlation with Critical Current Densities in High‐Tc Superconductors

Published online by Cambridge University Press:  28 February 2011

K. Jagannadham  and
J. Narayan
K. Jagannadham
Affiliation:
Department of Materials Science and Engineering North Carolina State University Raleigh, North Carolina 27695
J. Narayan
Affiliation:
Department of Materials Science and Engineering North Carolina State University Raleigh, North Carolina 27695
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Abstract

Geometrical modelling of grain boundaries in 123‐YBaCuO and 2223‐TlBaCaCuO systems is carried out for several misorientat‐ions. The a‐b and the a‐c type coincidence boundaries are analyzed to determine the fraction of Cu‐O planes that are continuous and the excess charge present at the boundary voids. The interg‐rain critical current density is determined as a function of the misorientation and the width of the boundary. The tunneling of superconductor pairs through the regions of distortions, giving rise to depression of the order parameter at the boundaries,is used to determine the critical current density in the weak coupling limit.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 169: Symposium M – High Temperature Superconductors: Fundamental Properties and Novel Materials Processing , 1989 , 817
Copyright
Copyright © Materials Research Society 1990

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