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Effects of Grain-Boundaries in Superconducting Materials

Published online by Cambridge University Press:  10 February 2011

J. J. Hogan-O'Neill ,
A. M. Martin  and
James F. Annett
J. J. Hogan-O'Neill
Affiliation:
University of Bristol, H.H. Wills Physics Laboratory, Royal Fort, Tyndall Ave, Bristol BS8 1TL, United Kingdom.
A. M. Martin
Affiliation:
University of Bristol, H.H. Wills Physics Laboratory, Royal Fort, Tyndall Ave, Bristol BS8 1TL, United Kingdom.
James F. Annett
Affiliation:
University of Bristol, H.H. Wills Physics Laboratory, Royal Fort, Tyndall Ave, Bristol BS8 1TL, United Kingdom.
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Abstract

We examine the effects of grain-boundaries on the order-parameter and critical-currents in superconductors. We use a geometrical model of the lattice structure of grain-boundaries. We solve the Bogoliubov-de Gennes equation using the Recursion Method to obtain the self-consistent BCS gap function Δ and the local density of states N(E) near the boundary. Imposing a phase difference across the boundary we calculate the supercurrent and hence obtain the critical-current, Ic, of the junction.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 491: Symposium R – Tight Binding Approach to Computational Materials Science , 1997 , 407
Copyright
Copyright © Materials Research Society 1998

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References

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