An evaluation of phase separated, self-assembled LaMnO3-MgO nanocomposite films directly on IBAD-MgO as buffer layers for flux pinning enhancements in YBa2YCu3O7-& coated conductors

Journal Article · Thu Dec 31 23:00:00 EST 2009 · Journal of Materials Research

DOI:https://doi.org/10.1557/JMR.2010.0073· OSTI ID:1021971

Polat, Ozgur ^[1]; Aytug, Tolga ^[1]; Paranthaman, Mariappan Parans ^[1]; Leonard, Keith J ^[1]; Lupini, Andrew R ^[1]; Pennycook, Stephen J ^[1]; Meyer, III, Harry M ^[1]; Kim, Kyunghoon ^[1]; Qiu, Xiaofeng ^[1]; Cook, Sylvester W ^[1]; Thompson, James R ^[1]; Christen, David K ^[1]; Goyal, Amit ^[1]; Selvamanickam, V. ^[2]; Xiong, X. ^[2]

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1. ORNL
2. SuperPower Incorporated, Schenectady, New York

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-d (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.

• Research Organization: Oak Ridge National Laboratory (ORNL)
• Sponsoring Organization: OE USDOE - Office of Electric Transmission and Distribution
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1021971
• Journal Information: Journal of Materials Research, Journal Name: Journal of Materials Research Journal Issue: 3 Vol. 25; ISSN 0884-2914
• Country of Publication: United States
• Language: English

Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
BARIUM OXIDES
BUFFERS
COATINGS
COPPER OXIDES
CRITICAL CURRENT
DEFECTS
DENSITY
EVALUATION
FILMS
GROWTH
HIGH-TC SUPERCONDUCTORS
LAYERS
MAGNETIC FIELDS
MAGNETIC FLUX
NANOSTRUCTURES
OPERATION
PERFORMANCE
SUPERCONDUCTING DEVICES
THICKNESS
YTTRIUM OXIDES