Recent progress in developing HTS quasi-particle injection devices

C.W. Schneider, R. Schneider, R. Moerman, G.J. Gerritsma, H. Rogalla

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    In recent years, there was some progress in developing HTS three-terminal devices based on quasi-particles injection with a current gain of up to 10. This is still one order less than already demonstrated for low-T-c junctions. The main obstacle for further progress is the unsolved problem of a suitable HTS barrier which allows for quasi-particle tunneling. If the preparation conditions for barrier materials such as natural YBa2Cu3O7-delta and SrTiO3 can be better controlled, as well as the quality of the YBa2Cu3O7-delta surface improved, this kind of device could be developed into a useful fast current switch or even implemented in superconducting digital electronics. We investigated the properties of planar injection devices with (001) YBa2Cu3O7-delta as HTS superconductor, a natural oxide, PTBa2Cu3O7-delta and PrBa2Cu3-xGaxO7-delta barriers with a normal conducting counter electrode. YBa2Cu3O7-delta films used showed an average surface roughness between 1 and 6 nm. The observed current gain for devices with a natural barrier was 6.2 at 40 K and for PBCO and PBCGO barrier less than one between T-c and 10 K.
    Original languageEnglish
    Title of host publicationApplied Superconductivity 1997
    Subtitle of host publicationProceedings of EUCAS 1997, Third European Conference on Applied Superconductivity, held in the Netherlands, 30 June-3 July 1997
    EditorsH. Rogalla, D.H.A. Blank
    PublisherInstitute of Physics (IOP)
    Number of pages4
    ISBN (Print)0750304871
    Publication statusPublished - 19 Dec 1997
    Event3rd European Conference on Applied Superconductivity, EUCAS 1997 - Veldhoven, Netherlands
    Duration: 30 Jun 19973 Jul 1997
    Conference number: 3

    Publication series

    NameInstitute of Physics Conference Series
    PublisherInstitute of Physics
    ISSN (Print)0951-3248


    Conference3rd European Conference on Applied Superconductivity, EUCAS 1997
    Abbreviated titleEUCAS


    • METIS-130020

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