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Critical Current Characteristics of Step-Edge YBa2Cu3Oy Weak Links

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Advances in Cryogenic Engineering Materials

Part of the book series: Advances in Cryogenic Engineering ((ACRE,volume 42))

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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.

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Authors and Affiliations

  1. Department of Physics, National Taiwan University, Taipei, Taiwan, R.O.C.

    H. C. Yang, J. H. Lu & B. Young

  2. Department of Physics, National Taiwan Normal University, Taipei, Taiwan, R.O.C.

    H. E. Horng

Authors
  1. H. C. Yang
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  2. J. H. Lu
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  3. B. Young
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  4. H. E. Horng
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Editor information

Editors and Affiliations

  1. Lawrence Livermore National Laboratory, University of California, Livermore, California, USA

    Leonard T. Summers

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© 1996 Springer Science+Business Media New York

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Yang, H.C., Lu, J.H., Young, B., Horng, H.E. (1996). Critical Current Characteristics of Step-Edge YBa2Cu3Oy Weak Links. In: Summers, L.T. (eds) Advances in Cryogenic Engineering Materials . Advances in Cryogenic Engineering Materials , vol 42. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-9059-7_86

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  • DOI: https://doi.org/10.1007/978-1-4757-9059-7_86

  • Publisher Name: Springer, Boston, MA

  • Print ISBN: 978-1-4757-9061-0

  • Online ISBN: 978-1-4757-9059-7

  • eBook Packages: Springer Book Archive

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