Physics – Condensed Matter – Superconductivity
Scientific paper
2007-10-24
Physics
Condensed Matter
Superconductivity
3 pages, 3 figures. The following article has been submitted to Applied Physics Letters. After it is published it will be foun
Scientific paper
10.1063/1.2828113
We have developed a nuclear magnetic resonance spectrometer with a series tuned input circuit for measurements on samples at millikelvin temperatures based on an integrated two-stage superconducting quantum interference device current sensor, with an energy sensitivty e = 26 +/-1 h when operated at 1.4K. To maximise the sensitivity both the NMR pickup coil and tuning capacitor need to be cooled, and the tank circuit parameters should be chosen to equalise the contributions from circulating current noise and voltage noise in the SQUID. A noise temperature TN = 7 +/-2 mK was measured, at a frequency of 0.884 MHz, with the circuit parameters close to optimum.
Bennett Ralph G.
Casey Andrew
Cowan B. P.
Drung Dietmar
Levitin L. V.
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