Nuclear quadrupole resonance detected at 30 MHz with a dc superconducting quantum interference device

Claude Hilbert, John Clarke, Tycho Sleator, Erwin L. Hahn

    Research output: Contribution to journalArticlepeer-review

    Abstract

    A dc superconducting quantum interference device is used as a tuned radio frequency amplifier at liquid helium temperatures to detect pulsed nuclear quadrupole resonance at ∼30 MHz. At a bath temperature of 4.2 K, a total system noise temperature of 6±1 K has been achieved, with a quality factor Q of 2500. A novel Q spoiler, consisting of a series array of Josephson tunnel junctions, reduces the ring-down time of the tuned circuit after each pulse. The minimum number of Bohr magnetons observable from a free precession signal after a single pulse is ∼2×1016 in a bandwidth of 10 kHz.

    Original languageEnglish (US)
    Pages (from-to)637-639
    Number of pages3
    JournalApplied Physics Letters
    Volume47
    Issue number6
    DOIs
    StatePublished - 1985

    ASJC Scopus subject areas

    • Physics and Astronomy (miscellaneous)

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