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Magnetic Flux Pinning in YBa2Cu3O7 Films

Published online by Cambridge University Press:  28 February 2011

H. R. Kerchner ,
R. Feenstra ,
J. O. Thomson ,
J. R. Thompson ,
D. K. Christen ,
S. T. Sekula  and
L. A. Boatner
H. R. Kerchner
Affiliation:
Oak Ridge National Laboratory, Solid State Division, Oak Ridge, TN 37931-6061
R. Feenstra
Affiliation:
Oak Ridge National Laboratory, Solid State Division, Oak Ridge, TN 37931-6061
J. O. Thomson
Affiliation:
Oak Ridge National Laboratory, Solid State Division, Oak Ridge, TN 37831-6061, and University of Tennessee, Knoxville, TN 37996-1200.
J. R. Thompson
Affiliation:
Oak Ridge National Laboratory, Solid State Division, Oak Ridge, TN 37831-6061, and University of Tennessee, Knoxville, TN 37996-1200.
D. K. Christen
Affiliation:
Oak Ridge National Laboratory, Solid State Division, Oak Ridge, TN 37931-6061
S. T. Sekula
Affiliation:
Oak Ridge National Laboratory, Solid State Division, Oak Ridge, TN 37931-6061
L. A. Boatner
Affiliation:
Oak Ridge National Laboratory, Solid State Division, Oak Ridge, TN 37931-6061
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Abstract

The magnetic hysteresis was studied for YBa2Cu3O7 films of different epitaxial orientations on single-crystal SrTiO3 and KTaO3 substrates. Deposition by coevaporation of Y, BaF2, and Cu was followed by annealing in flowing, wet oxygen at 800-850°C. The critical current density Jc deduced from magnetic hysteresis loops was compared with four-terminal transport-current results. Thermally activated magnetic flux flow was manifest in the audio-frequency data. Jc fits a scaling law similar to one used for describing Nb3Sn and other A15 materials.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 169: Symposium M – High Temperature Superconductors: Fundamental Properties and Novel Materials Processing , 1989 , 903
Copyright
Copyright © Materials Research Society 1990

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References

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