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YBa2Cu3O7−δ: Enhancing jc by Field Orientation

  • R. S. Markiewicz
  • K. Chen
  • B. Maheswaran
  • Y. P. Liu
  • B. C. Giessen
  • C. Chan

Abstract

Transport properties of dense, pressed pellets of field-oriented grains of YBa2Cu3O7−δ have been studied in the superconducting phase (T=77K) as a function of current, annealing time, and magnetic field. These pellets have strikingly different annealing properties from similarly prepared but unoriented samples. The oriented samples show significant enhancements in density and degree of orientation and transport j c with length of annealing time. The best samples have less than 2% of the x-ray intensity corresponding to misoriented grains, and a density so high that excess low-T oxygen annealing is required for the best j c (currently, j c (77K) > 1500A/cm2). These values are limited by the magnetic field generated by the current itself.

Keywords

Critical Current Magnetic Field Dependence Contact Resistivity Oriented Sample Josephson Effect 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1990

Authors and Affiliations

  • R. S. Markiewicz
    • 1
    • 4
  • K. Chen
    • 1
    • 4
  • B. Maheswaran
    • 1
    • 4
  • Y. P. Liu
    • 2
  • B. C. Giessen
    • 3
    • 4
  • C. Chan
    • 2
  1. 1.Departments of PhysicsNortheastern UniversityBostonUSA
  2. 2.Departments of Electrical EngineeringNortheastern UniversityBostonUSA
  3. 3.Departments of ChemistryNortheastern UniversityBostonUSA
  4. 4.Departments of Barnett InstituteNortheastern UniversityBostonUSA

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