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)


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.


Microwave Irradiation Critical Current Density Josephson Junction Step Height Step Edge 
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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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