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Title: Nano-engineered defect structures in Ce- and Ho-doped metal-organic chemical vapor deposited YBa{sub 2}Cu{sub 3}O{sub 3+{delta} }films : correlation of structure and chemistry with flux pinning performance.

Abstract

This study reports on the fabrication of metal-organic chemical vapor deposited (MOCVD) YBa{sub 2}Cu{sub 3}O{sub 6+{delta}} (YBCO) films doped with varying amounts of Ce and Ho and the characterization of their electrical, microstructural, and chemical properties. The films are prepared by vapor phase deposition of a Y-Ba-Cu precursor mix containing controlled amounts of Ce and Ho onto buffered metal strip templates. The comprehensive characterization of these films by critical current measurement, transmission electron microscopy, x-ray diffraction, Raman microspectroscopy, and x-ray absorption spectroscopy provides detailed information about the structure/chemistry/performance relationships and how they vary with varying amounts of Ce and Ho in the YBCO films. The microstructure exhibited by both the Ce-doped and the Ho-doped films contains a high density of crystal basal-plane aligned, fluoritelike precipitates within the YBCO matrix. For optimally doped samples, the influence of these nanocrystalline phases on the flux pinning properties manifests itself as a significant improvement in the critical current density (J{sub c}) for magnetic field orientations that approach being parallel to the ab planes of the YBCO, while no appreciable change is observed in either self-field J{sub c} or applied-field J{sub c} performance in the vicinity of field orientations parallel to the YBCO c-axis. Themore » Ce is almost exclusively concentrated in the fluoritelike nanoprecipitates, while the Ho incorporates into both the planar arrays of nanoprecipitates and the superconducting matrix, where it substitutes for Y in the YBCO lattice. The present findings for Ce and Ho doping are in interesting contrast with our prior findings for Zr-doped MOCVD films due to the fact that the Zr-doped films exhibit columnar precipitate arrays that produce a substantial improvement in J{sub c} for magnetic field orientations parallel to the YBCO c-axis, while no appreciable change is observed in either self-field or applied-field J{sub c} performance for field orientations parallel to the ab planes. These results suggest that improvement of the in-field J{sub c} of YBCO films over an extended range of field angles could be achieved by doping strategies that simultaneously produce both ab-plane aligned and c-axis aligned precipitate arrays.« less

Authors:
; ; ; ; ; ; ; ; ; ;  [1]
  1. Materials Science Division
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1020704
Report Number(s):
ANL/MSD/JA-70503
Journal ID: 0021-8979; TRN: US201116%%601
DOE Contract Number:  
DE-AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
J. Appl. Phys.
Additional Journal Information:
Journal Volume: 109; Journal Issue: 11 ; Jun. 1, 2011
Country of Publication:
United States
Language:
ENGLISH
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ABSORPTION SPECTROSCOPY; CHEMICAL PROPERTIES; CHEMISTRY; CRITICAL CURRENT; DEFECTS; DEPOSITION; FABRICATION; MAGNETIC FIELDS; MAGNETIC FLUX; MICROSTRUCTURE; PERFORMANCE; PRECURSOR; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION

Citation Formats

Aytug, T, Chen, Z, Maroni, V A, Miller, D J, Cantoni, C, Specht, E D, Kropf, A J, Zaluzec, N, Zhang, Y, Zuev, Y, Paranthaman, M, CSE), and ORNL). Nano-engineered defect structures in Ce- and Ho-doped metal-organic chemical vapor deposited YBa{sub 2}Cu{sub 3}O{sub 3+{delta} }films : correlation of structure and chemistry with flux pinning performance.. United States: N. p., 2011. Web. doi:10.1063/1.3592244.
Aytug, T, Chen, Z, Maroni, V A, Miller, D J, Cantoni, C, Specht, E D, Kropf, A J, Zaluzec, N, Zhang, Y, Zuev, Y, Paranthaman, M, CSE), & ORNL). Nano-engineered defect structures in Ce- and Ho-doped metal-organic chemical vapor deposited YBa{sub 2}Cu{sub 3}O{sub 3+{delta} }films : correlation of structure and chemistry with flux pinning performance.. United States. https://doi.org/10.1063/1.3592244
Aytug, T, Chen, Z, Maroni, V A, Miller, D J, Cantoni, C, Specht, E D, Kropf, A J, Zaluzec, N, Zhang, Y, Zuev, Y, Paranthaman, M, CSE), and ORNL). Wed . "Nano-engineered defect structures in Ce- and Ho-doped metal-organic chemical vapor deposited YBa{sub 2}Cu{sub 3}O{sub 3+{delta} }films : correlation of structure and chemistry with flux pinning performance.". United States. https://doi.org/10.1063/1.3592244.
@article{osti_1020704,
title = {Nano-engineered defect structures in Ce- and Ho-doped metal-organic chemical vapor deposited YBa{sub 2}Cu{sub 3}O{sub 3+{delta} }films : correlation of structure and chemistry with flux pinning performance.},
author = {Aytug, T and Chen, Z and Maroni, V A and Miller, D J and Cantoni, C and Specht, E D and Kropf, A J and Zaluzec, N and Zhang, Y and Zuev, Y and Paranthaman, M and CSE) and ORNL)},
abstractNote = {This study reports on the fabrication of metal-organic chemical vapor deposited (MOCVD) YBa{sub 2}Cu{sub 3}O{sub 6+{delta}} (YBCO) films doped with varying amounts of Ce and Ho and the characterization of their electrical, microstructural, and chemical properties. The films are prepared by vapor phase deposition of a Y-Ba-Cu precursor mix containing controlled amounts of Ce and Ho onto buffered metal strip templates. The comprehensive characterization of these films by critical current measurement, transmission electron microscopy, x-ray diffraction, Raman microspectroscopy, and x-ray absorption spectroscopy provides detailed information about the structure/chemistry/performance relationships and how they vary with varying amounts of Ce and Ho in the YBCO films. The microstructure exhibited by both the Ce-doped and the Ho-doped films contains a high density of crystal basal-plane aligned, fluoritelike precipitates within the YBCO matrix. For optimally doped samples, the influence of these nanocrystalline phases on the flux pinning properties manifests itself as a significant improvement in the critical current density (J{sub c}) for magnetic field orientations that approach being parallel to the ab planes of the YBCO, while no appreciable change is observed in either self-field J{sub c} or applied-field J{sub c} performance in the vicinity of field orientations parallel to the YBCO c-axis. The Ce is almost exclusively concentrated in the fluoritelike nanoprecipitates, while the Ho incorporates into both the planar arrays of nanoprecipitates and the superconducting matrix, where it substitutes for Y in the YBCO lattice. The present findings for Ce and Ho doping are in interesting contrast with our prior findings for Zr-doped MOCVD films due to the fact that the Zr-doped films exhibit columnar precipitate arrays that produce a substantial improvement in J{sub c} for magnetic field orientations parallel to the YBCO c-axis, while no appreciable change is observed in either self-field or applied-field J{sub c} performance for field orientations parallel to the ab planes. These results suggest that improvement of the in-field J{sub c} of YBCO films over an extended range of field angles could be achieved by doping strategies that simultaneously produce both ab-plane aligned and c-axis aligned precipitate arrays.},
doi = {10.1063/1.3592244},
url = {https://www.osti.gov/biblio/1020704}, journal = {J. Appl. Phys.},
number = 11 ; Jun. 1, 2011,
volume = 109,
place = {United States},
year = {2011},
month = {6}
}