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A nuclear magnetic resonance spectrometer for operation around with a sub- noise temperature, based on a two-stage dc superconducting quantum interference device sensor
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10.1063/1.2828113
/content/aip/journal/apl/91/26/10.1063/1.2828113
http://aip.metastore.ingenta.com/content/aip/journal/apl/91/26/10.1063/1.2828113

Figures

Image of FIG. 1.
FIG. 1.

Schematic diagram of the tuned NMR spectrometer. The two-stage SQUID sensor is depicted here as a single SQUID. The device contains an integrated input coil and spoiler. The temperature of the pickup coil and capacitor can be varied. Inductance represents the NMR transmitter coil.

Image of FIG. 2.
FIG. 2.

Frequency dependence of the flux noise referred to the first stage SQUID measured in open loop mode, with the pickup coil at . Off-resonance noise corresponds to . Both Johnson noise in the pickup coil and circulating current noise in the SQUID contribute to the peak noise. Inset shows the noise in the vicinity of the peak for coil temperatures of 20, 55, 100, 200, 400, and .

Image of FIG. 3.
FIG. 3.

Resonance noise spectral density normalized by the off-resonance noise for , extrapolates to zero at with .

Tables

Generic image for table
Table I.

Measured and predicted at five different working points. Predicted obtained using Eq. (7) for extracted from values.

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/content/aip/journal/apl/91/26/10.1063/1.2828113
2007-12-26
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: A nuclear magnetic resonance spectrometer for operation around 1MHz with a sub-10-mK noise temperature, based on a two-stage dc superconducting quantum interference device sensor
http://aip.metastore.ingenta.com/content/aip/journal/apl/91/26/10.1063/1.2828113
10.1063/1.2828113
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