TITLE

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

AUTHOR(S)
Hilbert, Claude; Clarke, John; Sleator, Tycho; Hahn, Erwin L.
PUB. DATE
September 1985
SOURCE
Applied Physics Letters;9/15/1985, Vol. 47 Issue 6, p637
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
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.
ACCESSION #
9818139

 

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