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Superconducting Properties of High-Jc MgB2 Coatings

Published online by Cambridge University Press:  18 March 2011

D. K. Christen ,
C. Cantoni ,
J. R. Thompson ,
M. Paranthaman ,
M. F. Chisholm ,
H. R. Kerchner  and
H. M. Christen
D. K. Christen
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, TN 37831
C. Cantoni
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, TN 37831
J. R. Thompson
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, TN 37831
M. Paranthaman
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, TN 37831
M. F. Chisholm
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, TN 37831
H. R. Kerchner
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, TN 37831
H. M. Christen
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, TN 37831
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Abstract

We report the fabrication and superconducting properties of ∼0.5 μm thick, fine-grained polycrystalline coatings of MgB2 on single-crystal substrate surfaces. The films exhibit large critical current densities, implying little effect from the grain boundaries. Analyses for thermal activation effects are inconclusive, and evidence is presented that the irreversibility line is dominated by the combined influences of Hc2 anisotropy and polycrystallinity. Comparative studies of the magnetic persistent currents and electrical transport properties reveal excellent agreement over a wide range of temperature and magnetic field. This result is contrary to similar comparisons on high-temperature cuprates, where disparities arise from the effects of large flux creep and the diverse electric field regimes probed by the two techniques. The MgB2 films exhibit extremely sharp voltage-current relations away from the irreversibility line, in qualitative agreement with observed large Jc values and low rates of magnetic flux creep.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 689: Symposium E – Materials for High-Temperature Superconductor Technologies , 2001 , E2.1
Copyright
Copyright © Materials Research Society 2002

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References

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