VTT QUANTUM-hall setup

Timo Varpula, Heikki Seppä

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    1 Citation (Scopus)


    The authors present a compact setup for quantum Hall measurements consisting of an overlapped-tube cryogenic current comparator, where the imbalance is detected with a sensitive DC-SQUID (superconducting quantum interference device) magnetometer, and a small superconducting magnet system operated in a standard liquid-helium storage dewar. The system also incorporates PC-controlled electronics, which facilitates automatic measurements. The setup has been developed for a small-scale national standards laboratory where resistance calibrations at an uncertainty level of 10/sup -8/ are performed. A block diagram of the electronics of the measurement setup is shown along with a 1.5 K insert that includes a complete superconducting magnet system and the quantum-Hall probe.
    Original languageEnglish
    Title of host publicationCPEM'90 Digest
    Subtitle of host publicationConference on Precision Electromagnetic Measurements
    EditorsGary R. Hanes
    Place of PublicationNew York
    PublisherIEEE Institute of Electrical and Electronic Engineers
    Publication statusPublished - 1990
    MoE publication typeA4 Article in a conference publication
    EventCPEM'90: Conference on Precision Electromagnetic Measurements - Ottawa, Canada
    Duration: 11 Jul 199014 Jul 1990




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