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An evaluation of phase separated, self-assembled LaMnO3-MgO nanocomposite films directly on IBAD-MgO as buffer layers for flux pinning enhancements in YBa2Cu3O7-δ coated conductors

Published online by Cambridge University Press:  31 January 2011

Özgür Polat ,
Tolga Aytug ,
M. Parans Paranthaman ,
Keith J. Leonard ,
Andrew R. Lupini ,
Steve J. Pennycook ,
Harry M. Meyer ,
Kim Kim ,
Xiaofeng Qiu  and
Sylvester Cook
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Özgür Polat
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831; and Department of Physics & Astronomy, The University of Tennessee, Knoxville, Tennessee 37996
Sylvester Cook
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
James R. Thompson
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831; and Department of Physics & Astronomy, The University of Tennessee, Knoxville, Tennessee 37996
Amit Goyal
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
Venkat Selvamanickam
Affiliation:
SuperPower, Inc., Schenectady, New York 12304
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Abstract

Technological applications of high temperature superconductors (HTS) require high critical current density, Jc, under operation at high magnetic field strengths. This requires effective flux pinning by introducing artificial defects through creative processing. In this work, we evaluated the feasibility of mixed-phase LaMnO3:MgO (LMO:MgO) films as a potential cap buffer layer for the epitaxial growth and enhanced performance of YBa2Cu3O7-δ (YBCO) films. Such composite films were sputter deposited directly on IBAD-MgO templates (with no additional homo-epitaxial MgO layer) and revealed the formation of two phase-separated, but at the same time vertically aligned, self-assembled composite nanostructures that extend throughout the entire thickness of the film. The YBCO coatings deposited on these nanostructured cap layers showed correlated c-axis pinning and improved in-field Jc performance compared to those of YBCO films fabricated on standard LMO buffers. Microstructural characterization revealed additional extended disorder in the YBCO matrix. The present results demonstrate the feasibility of novel and potentially practical approaches in the pursuit of more efficient, economical, and high performance superconducting devices.

Keywords

SuperconductingSelf-assemblyNucleation & growth

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Type
Articles
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Journal of Materials Research , Volume 25 , Issue 3 , March 2010 , pp. 437 - 443
Copyright
Copyright © Materials Research Society 2010

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References

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