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The Influence of Transport Currents on the Harmonic Generation in High Tc Superconductors

Published online by Cambridge University Press:  26 February 2011

J. Wang ,
Y. Yue ,
K. N. R. Taylor ,
G. J. Russell ,
D. N. Matthews  and
S. X. Dou
J. Wang
Affiliation:
School of Materials Science and EngineeringUniversity of New South Wales, PO Box 1, Kensington, NSW 2033, Australia
Y. Yue
Affiliation:
Advanced Electronic Materials, School of Physics, University of New South Wales, PO Box 1, Kensington, NSW 2033, Australia
K. N. R. Taylor
Affiliation:
Advanced Electronic Materials, School of Physics, University of New South Wales, PO Box 1, Kensington, NSW 2033, Australia
G. J. Russell
Affiliation:
Advanced Electronic Materials, School of Physics, University of New South Wales, PO Box 1, Kensington, NSW 2033, Australia
D. N. Matthews
Affiliation:
Advanced Electronic Materials, School of Physics, University of New South Wales, PO Box 1, Kensington, NSW 2033, Australia
S. X. Dou
Affiliation:
School of Materials Science and EngineeringUniversity of New South Wales, PO Box 1, Kensington, NSW 2033, Australia
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Abstract

This paper details the experimental results for the influence of transport currents on the ac magnetisation of high-Tc superconductors. It has been found that the variation of the third harmonic amplitude V3 with an ac field can still be described by square and cubic laws for low and high ac fields, respectively, the same relationships as observed in the absence of transport currents. The only significant difference is that the magnitude of V3 in the low field region increases linearly with transport current. Consequently, the crossover point (from square law to cubic law) moves to higher ac fields and the variation of V3 with transport current is less pronounced in the high field region. The results are explained in terms of an effective increase in Hg, which is a parameter in Kim critical state model, with increase of transport current.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 275: Symposium S – Layered Superconductors: Fabrication, Properties and Applications , 1992 , 227
Copyright
Copyright © Materials Research Society 1992

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References

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