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Critical Current Characteristics of Step-Edge YBa2Cu3Oy Weak Links

  • H. C. Yang
  • J. H. Lu
  • B. Young
  • H. E. Horng
Part of the Advances in Cryogenic Engineering Materials book series (ACRE, volume 42)

Abstract

YBa2Cu3Oy (YBCO) junctions were fabricated across the step-edge on MgO (001) substrates. The line of the step-edge made an angle, a, of 90°, 45°, or 22.5°° with the crystal a-axis. The step heights were 120–350 nm. YBCO films were grown onto the MgO (001) (the step-edge substrate) using an off axis rf magnetron sputtering system. The YBCO films were patterned to a 10 jam narrow strip crossing the edges. The critical current densities of YBCO junctions at T/Tc = 0.9 varied from 103 — 105 A/cm2 depending on ratio of the step height to the film thickness. The I-V curves under microwave irradiation showed Shapiro steps, indicating weak-link behavior. Using the step-edge junctions, we fabricated and characterized junctions and SQUIDs.

Keywords

Microwave Irradiation Critical Current Density Josephson Junction Step Height Step Edge 
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 1996

Authors and Affiliations

  • H. C. Yang
    • 1
  • J. H. Lu
    • 1
  • B. Young
    • 1
  • H. E. Horng
    • 2
  1. 1.Department of PhysicsNational Taiwan UniversityTaipei, TaiwanR.O.C.
  2. 2.Department of PhysicsNational Taiwan Normal UniversityTaipei, TaiwanR.O.C.

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