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

Journal Article · Sun Sep 15 00:00:00 EDT 1985 · Appl. Phys. Lett.; (United States)

DOI:https://doi.org/10.1063/1.96042· OSTI ID:5451470

Hilbert, C; Clarke, J; Sleator, T; Hahn, E L

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 approx.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 approx.2 x 10/sup 16/ in a bandwidth of 10 kHz.

• Research Organization: Department of Physics, University of California, Berkeley, California 94720 and Materials and Molecular Research Division, Lawrence Berkeley Laboratory, Berkeley, California 94720
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5451470
• Journal Information: Appl. Phys. Lett.; (United States), Vol. 47:6
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AMPLIFIERS
SQUID DEVICES
NUCLEAR QUADRUPOLE RESONANCE
MEASURING METHODS
FABRICATION
NOISE
QUALITY FACTOR
EXPERIMENTAL DATA
JOSEPHSON JUNCTIONS
MHZ RANGE 01-100
ULTRALOW TEMPERATURE
DATA
ELECTRONIC EQUIPMENT
EQUIPMENT
FLUXMETERS
FREQUENCY RANGE
INFORMATION
JUNCTIONS
MEASURING INSTRUMENTS
MHZ RANGE
MICROWAVE EQUIPMENT
NUMERICAL DATA
RESONANCE
SUPERCONDUCTING DEVICES
SUPERCONDUCTING JUNCTIONS
420201* - Engineering- Cryogenic Equipment & Devices