A microkelvin magnetic flux noise thermometer

Due to its non-driven nature, noise thermometry intrinsically is the method of choice when minimal heat input during the temperature measurement is required. Our noise thermometer, experimentally characterized for temperatures between 42 $${{\upmu }}$$μK and 0.8 K, is a magnetic Johnson noise thermo...

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Hauptverfasser: Rothfuß, Daniel Simon (VerfasserIn) , Reiser, Andreas (VerfasserIn) , Fleischmann, Andreas (VerfasserIn) , Enss, Christian (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 17 March 2014
In: Journal of low temperature physics
Year: 2014, Jahrgang: 175, Heft: 5, Pages: 776-783
ISSN:1573-7357
DOI:10.1007/s10909-014-1146-0
Online-Zugang:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1007/s10909-014-1146-0
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Verfasserangaben:D. Rothfuß, A. Reiser, A. Fleischmann, C. Enss

MARC

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520 |a Due to its non-driven nature, noise thermometry intrinsically is the method of choice when minimal heat input during the temperature measurement is required. Our noise thermometer, experimentally characterized for temperatures between 42 $${{\upmu }}$$μK and 0.8 K, is a magnetic Johnson noise thermometer. The noise source is a cold-worked high purity copper cylinder, 5 mm in diameter and 20 mm long. The magnetic flux fluctuations generated by the electrons’ Brownian motion is measured inductively by two dc-SQUID magnetometers simultaneously. Cross-correlation of the two channels leads to reduction of parasitic noise by more than one order of magnitude which allows for measuring the tiny noise powers at microkelvin temperatures. 
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