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

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 feasibi...

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Bibliographic Details
Published in:Journal of materials research 2010-03, Vol.25 (3), p.437-443
Main Authors: Polat, Özgür, Aytug, Tolga, Paranthaman, M. Parans, Leonard, Keith J., Lupini, Andrew R., Pennycook, Steve J., Meyer, Harry M., Kim, Kim, Qiu, Xiaofeng, Cook, Sylvester, Thompson, James R., Christen, David K., Goyal, Amit, Xiong, Xumin, Selvamanickam, Venkat
Format: Article
Language:English
Subjects:
Applied and Technical Physics
Biomaterials
Inorganic Chemistry
Materials Engineering
Materials Science
Nanotechnology
Nucleation & growth
Self-assembly
Superconducting
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Summary: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.
ISSN:0884-2914
2044-5326
DOI:10.1557/JMR.2010.0073