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A Microkelvin Magnetic Flux Noise Thermometer

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Abstract

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 \({{\upmu }}\)K 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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Notes

  1. XXF-1, Magnicon GmbH, Lemsahler Landstr. 17, Hamburg, Germany.

  2. Puratronic, Fe:0.009ppm, Alfa Aesar, 26 Parkridge Rd, Ward Hill, MA 01835, USA

  3. OP27, Analog Devices,Inc. , 3 Technology Way, Norwood, MA 02062, USA.

  4. ME-4610, Rev. 1.2D, Meilhaus Electronic GmbH, Puchheim, Germany.

  5. Thickfilm resistor, Vishay, type: RCWP-575.

  6. LR-700 AC resistance bridge, Linear Research INC., San Diego, CA, USA.

  7. PLM-4, RV-Elektroniikka, Vantaa, Finland.

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Acknowledgments

Fruitful discussions with J. Beyer, J. Engert and S. Kempf are gratefully acknowledged. This work is supported by the European Community Research Infrastructures under the FP7 Capacities Specific Program, MICROKELVIN project number 228464.

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Authors and Affiliations

  1. Kirchhoff-Institute for Physics, Heidelberg University, Im Neuenheimer Feld 227, 69120 , Heidelberg, Germany

    D. Rothfuß, A. Reiser, A. Fleischmann & C. Enss

Authors
  1. D. Rothfuß
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  2. A. Reiser
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  3. A. Fleischmann
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  4. C. Enss
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Correspondence to A. Reiser.

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Rothfuß, D., Reiser, A., Fleischmann, A. et al. A Microkelvin Magnetic Flux Noise Thermometer. J Low Temp Phys 175, 776–783 (2014). https://doi.org/10.1007/s10909-014-1146-0

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  • DOI: https://doi.org/10.1007/s10909-014-1146-0

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