Impedance of radio-frequency-biased resistive superconducting quantum interference devices

Soulen, R. J.; Vechten, D. Van

doi:10.1103/physrevb.36.239

Cited by 12 publications

(2 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…17 Briefly summarized, it consisted of a 3 He-4 He dilution refrigerator located inside a radio-frequency-shielded cage. Two high-permeability cylin-drical magnetic shields ͑-metal at room temperature and Cryoperm 18 at 4 K͒ reduced all components of the dc magnetic field at the sample to less than 0.1 T. 19 The bottom of the mixing chamber of the refrigerator was tailored to accept several thermometers and special holders for the samples.…”

Section: Experiment: Description Of the Apparatus And Measuremenmentioning

confidence: 99%

Temperature and magnetic field dependence of the induced magnetization in macroscopic samples due to the proximity effect

et al. 1997

Self Cite

View full text Add to dashboard Cite

We have applied the Ginzburg-Landau equations to calculate the behavior of the diamagnetism of macroscopic samples consisting of a normal metal in contact with a superconductor. In particular, the calculation focuses on the temperature region above the superconductive transition temperature T cN of the normal metal. We have compared these calculations with experimental measurements of the temperature ͑0.006-1 K͒ and magnetic field (10 Ϫ9 -10 Ϫ6 T) dependence of the diamgnetism for several samples of Be (T cN ϳ23 mK) and W (T cN ϳ15.5 mK) in contact with the superconductor Al (T cS ϭ1.18 K). The agreement between the predictions and measurements is quite good and confirms the approach of using the Ginzburg-Landau model to calculate the proximity effect in macroscopic normal systems above their superconductive transitions.

show abstract

Section: Experiment: Description Of the Apparatus And Measuremenmentioning

confidence: 99%

Temperature and magnetic field dependence of the induced magnetization in macroscopic samples due to the proximity effect

et al. 1997

Self Cite

View full text Add to dashboard Cite

show abstract

“…First of all, the measured impedance of the noise resistor is not generally identical to its resistance. It depends on the ratio of the bias current to the critical current of the junction, on the high frequency power applied to the device, and on the ratio of this frequency to !he tank circuit resonance frequency (Soulen and Giffard 1978, Seppii 1984a, Erne and Luther 1984, Soulen and Van Vechten 1987, Seppa 1989. Further, in addition to a noise contribution of the junction itself (Likharev and Semenov 1972), which can be made negligible in practice, there may appear part of the tank circuit high frequency noise mixed down by !he junction into the thermal noise (Seppii et nll983, Seppii 1984b).…”

Section: Noise Thermometrymentioning

confidence: 99%

Thermometry below 1 K

1994

View full text Add to dashboard Cite

Temperature measurements below 1 K are relatively easy if they are only made to provide a scaling parameter for some other physical quantity because there is a multitude of practical methods to use. That there is problem of relating these measurements to the thermodynamic basis of temperature, however, becomes obvious when any two methods are applied simultaneously and produce discrepant results. Solving this problem requires identification and correction of systematic errors by analysing their sources for each thermometer in detail. In the very few cases where this procedure is successful, one obtains a primary thermometer. Since no primary thermometer is available that is also easily reproducible, one has to leave the firm thermodynamic basis frequently in favour of the reliability of secondary thermometers.This paper reviews the current status of thermometry from a metrological point of view. It emphasizes the relation to thermodynamic temperature without completely ignoring practical questions. Thus principles and limitations are discussed in detail for primary thermometers as well as for those secondary thermometers that can be employed to extend the temperature range by extrapolation. Practical thermometry is covered in a few instructive examples which illustrate the effects of experimental problems on temperature measurement. A considerable fraction of the paper is devoted to temperature reference standards, and the actual state of their underlying scales, that are used to reproduce accurately temperature values for calibration of secondary thermometers without running primary thermometers.

show abstract