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Interfacial defects distribution and strain coupling in the vertically aligned nanocomposite YBa2Cu3O7-X/ BaSnO3 thin films

Published online by Cambridge University Press:  09 May 2012

Yuanyuan Zhu ,
Chen-Fong Tsai ,
Jie Wang ,
Ji Heon Kwon ,
Haiyan Wang ,
Chakrapani V. Varanasi ,
Jack Burke ,
Lyle Brunke  and
Paul N. Barnes
Yuanyuan Zhu
Affiliation:
Department of Electrical and Computer Engineering, Texas A & M University, College Station, Texas 77843-3128
Chen-Fong Tsai
Affiliation:
Department of Electrical and Computer Engineering, Texas A & M University, College Station, Texas 77843-3128
Jie Wang
Affiliation:
Department of Electrical and Computer Engineering, Texas A & M University, College Station, Texas 77843-3128
Ji Heon Kwon
Affiliation:
Department of Electrical and Computer Engineering, Texas A & M University, College Station, Texas 77843-3128
Haiyan Wang*
Affiliation:
Department of Electrical and Computer Engineering, Texas A & M University, College Station, Texas 77843-3128
Chakrapani V. Varanasi
Affiliation:
University of Dayton Research Institute, Dayton, Ohio 45469
Jack Burke
Affiliation:
University of Dayton Research Institute, Dayton, Ohio 45469
Lyle Brunke
Affiliation:
University of Dayton Research Institute, Dayton, Ohio 45469
Paul N. Barnes
Affiliation:
Air Force Research Laboratory, Wright-Patterson AFB, Ohio 45433
*
a)Address all correspondence to this author. e-mail: wangh@ece.tamu.edu
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Abstract

In this article, we report the unique microstructural characteristics of YBa2Cu3O7-x (YBCO)/BaSnO3 (BSO) nanocomposite thin films on LaAlO3 (LAO) substrates. The BSO secondary phase grows as self-assembled vertically aligned nanopillars uniformly distributed in the superconducting YBCO matrix. Detailed microstructure and strain studies including x-ray diffraction, cross-section and plan-view transmission electron microscopy, and geometric phase analysis reveal that, as the BSO doping concentration varied from 2 mol% to 20 mol%, the nanopillar density increased from 0.26 × 1011/cm2 to 1.44 × 1011/cm2 while the diameter of the nanopillars remains relatively constant (7–8 nm in diameter). The strain state of the YBCO matrix is affected by both lateral and vertical lattice strains; while, the BSO lattice is strongly tuned by YBCO rather than the substrate. A high-density array of dislocations in the order of 1013/cm2 was observed along the vertical heterogeneous interfaces throughout the YBCO film thickness for all doping concentrations.

Keywords

superconductingnanostructurestress/strain relationship
Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 13 , 14 July 2012 , pp. 1763 - 1769
Copyright
Copyright © Materials Research Society 2012

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