Optimization of step-edge substrates for high-T C superconducting devices

C. H. Wu, M. J. Chen, M. H. Hsu, J. C. Chen, K. L. Chen, J. H. Chen, J. T. Jeng, T. S. Lai, Herng-Er Horng, Hong-Chang Yang

    Research output: Contribution to journalArticle

    6 Citations (Scopus)

    Abstract

    To pursue step-edge for high-T C superconducting grain boundary junctions or SQUIDs with high reproducibility and quality, we have developed two-step procedures of fabricating very good step-edge substrates. A protocol of precisely controlling step angles for Josephson junctions has been established, with which we can predict the step angles as well as get a better control of the fabrication process. The procedures can improve the step ramp quality substantially. There are no needles, waves, trenches, cascade, or other flaws on these surfaces. The step substrates present good uniformity with respect to any step angle. We have characterized high-T C step-edge dc SQUIDs connected in series. The I-V curves of SQUID arrays show the RSJ behavior. The enhanced modulation amplitude of 110 μV is achieved at 77 K with the step-edge dc SQUID in series. The results clearly show the high uniformity and quality of the fabricated step-edge Josephson junctions.

    Original languageEnglish
    Pages (from-to)108-114
    Number of pages7
    JournalPhysica C: Superconductivity and its applications
    Volume433
    Issue number1-2
    DOIs
    Publication statusPublished - 2005 Dec 1

    Fingerprint

    Superconducting devices
    superconducting devices
    SQUIDs
    optimization
    Substrates
    Amplitude modulation
    Needles
    Grain boundaries
    Josephson junctions
    Fabrication
    Defects
    ramps
    needles
    cascades

    Keywords

    • SQUID
    • Serial SQUID arrays
    • Step-edge

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics
    • Energy Engineering and Power Technology
    • Electrical and Electronic Engineering

    Cite this

    Wu, C. H., Chen, M. J., Hsu, M. H., Chen, J. C., Chen, K. L., Chen, J. H., ... Yang, H-C. (2005). Optimization of step-edge substrates for high-T C superconducting devices Physica C: Superconductivity and its applications, 433(1-2), 108-114. https://doi.org/10.1016/j.physc.2005.10.006

    Optimization of step-edge substrates for high-T C superconducting devices . / Wu, C. H.; Chen, M. J.; Hsu, M. H.; Chen, J. C.; Chen, K. L.; Chen, J. H.; Jeng, J. T.; Lai, T. S.; Horng, Herng-Er; Yang, Hong-Chang.

    In: Physica C: Superconductivity and its applications, Vol. 433, No. 1-2, 01.12.2005, p. 108-114.

    Research output: Contribution to journalArticle

    Wu, CH, Chen, MJ, Hsu, MH, Chen, JC, Chen, KL, Chen, JH, Jeng, JT, Lai, TS, Horng, H-E & Yang, H-C 2005, ' Optimization of step-edge substrates for high-T C superconducting devices ', Physica C: Superconductivity and its applications, vol. 433, no. 1-2, pp. 108-114. https://doi.org/10.1016/j.physc.2005.10.006
    Wu, C. H. ; Chen, M. J. ; Hsu, M. H. ; Chen, J. C. ; Chen, K. L. ; Chen, J. H. ; Jeng, J. T. ; Lai, T. S. ; Horng, Herng-Er ; Yang, Hong-Chang. / Optimization of step-edge substrates for high-T C superconducting devices In: Physica C: Superconductivity and its applications. 2005 ; Vol. 433, No. 1-2. pp. 108-114.
    @article{86f5ca82cd9c48e79da7aadb11fdde5a,
    title = "Optimization of step-edge substrates for high-T C superconducting devices",
    abstract = "To pursue step-edge for high-T C superconducting grain boundary junctions or SQUIDs with high reproducibility and quality, we have developed two-step procedures of fabricating very good step-edge substrates. A protocol of precisely controlling step angles for Josephson junctions has been established, with which we can predict the step angles as well as get a better control of the fabrication process. The procedures can improve the step ramp quality substantially. There are no needles, waves, trenches, cascade, or other flaws on these surfaces. The step substrates present good uniformity with respect to any step angle. We have characterized high-T C step-edge dc SQUIDs connected in series. The I-V curves of SQUID arrays show the RSJ behavior. The enhanced modulation amplitude of 110 μV is achieved at 77 K with the step-edge dc SQUID in series. The results clearly show the high uniformity and quality of the fabricated step-edge Josephson junctions.",
    keywords = "SQUID, Serial SQUID arrays, Step-edge",
    author = "Wu, {C. H.} and Chen, {M. J.} and Hsu, {M. H.} and Chen, {J. C.} and Chen, {K. L.} and Chen, {J. H.} and Jeng, {J. T.} and Lai, {T. S.} and Herng-Er Horng and Hong-Chang Yang",
    year = "2005",
    month = "12",
    day = "1",
    doi = "10.1016/j.physc.2005.10.006",
    language = "English",
    volume = "433",
    pages = "108--114",
    journal = "Physica C: Superconductivity and its Applications",
    issn = "0921-4534",
    publisher = "Elsevier",
    number = "1-2",

    }

    TY - JOUR

    T1 - Optimization of step-edge substrates for high-T C superconducting devices

    AU - Wu, C. H.

    AU - Chen, M. J.

    AU - Hsu, M. H.

    AU - Chen, J. C.

    AU - Chen, K. L.

    AU - Chen, J. H.

    AU - Jeng, J. T.

    AU - Lai, T. S.

    AU - Horng, Herng-Er

    AU - Yang, Hong-Chang

    PY - 2005/12/1

    Y1 - 2005/12/1

    N2 - To pursue step-edge for high-T C superconducting grain boundary junctions or SQUIDs with high reproducibility and quality, we have developed two-step procedures of fabricating very good step-edge substrates. A protocol of precisely controlling step angles for Josephson junctions has been established, with which we can predict the step angles as well as get a better control of the fabrication process. The procedures can improve the step ramp quality substantially. There are no needles, waves, trenches, cascade, or other flaws on these surfaces. The step substrates present good uniformity with respect to any step angle. We have characterized high-T C step-edge dc SQUIDs connected in series. The I-V curves of SQUID arrays show the RSJ behavior. The enhanced modulation amplitude of 110 μV is achieved at 77 K with the step-edge dc SQUID in series. The results clearly show the high uniformity and quality of the fabricated step-edge Josephson junctions.

    AB - To pursue step-edge for high-T C superconducting grain boundary junctions or SQUIDs with high reproducibility and quality, we have developed two-step procedures of fabricating very good step-edge substrates. A protocol of precisely controlling step angles for Josephson junctions has been established, with which we can predict the step angles as well as get a better control of the fabrication process. The procedures can improve the step ramp quality substantially. There are no needles, waves, trenches, cascade, or other flaws on these surfaces. The step substrates present good uniformity with respect to any step angle. We have characterized high-T C step-edge dc SQUIDs connected in series. The I-V curves of SQUID arrays show the RSJ behavior. The enhanced modulation amplitude of 110 μV is achieved at 77 K with the step-edge dc SQUID in series. The results clearly show the high uniformity and quality of the fabricated step-edge Josephson junctions.

    KW - SQUID

    KW - Serial SQUID arrays

    KW - Step-edge

    UR - http://www.scopus.com/inward/record.url?scp=28144441350&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=28144441350&partnerID=8YFLogxK

    U2 - 10.1016/j.physc.2005.10.006

    DO - 10.1016/j.physc.2005.10.006

    M3 - Article

    VL - 433

    SP - 108

    EP - 114

    JO - Physica C: Superconductivity and its Applications

    JF - Physica C: Superconductivity and its Applications

    SN - 0921-4534

    IS - 1-2

    ER -