Traceable Coulomb blockade thermometry

Ossi Hahtela (Corresponding Author), Emma Mykkänen, Antti Kemppinen, Matthias Meschke, Mika Prunnila, David Gunnarsson, Leif Roschier, Jari Penttilä, Jukka Pekola

    Research output: Contribution to journalArticleScientificpeer-review

    10 Citations (Scopus)

    Abstract

    We present a measurement and analysis scheme for determining traceable thermodynamic temperature at cryogenic temperatures using Coulomb blockade thermometry. The uncertainty of the electrical measurement is improved by utilizing two sampling digital voltmeters instead of the traditional lock-in technique. The remaining uncertainty is dominated by that of the numerical analysis of the measurement data. Two analysis methods are demonstrated: numerical fitting of the full conductance curve and measuring the height of the conductance dip. The complete uncertainty analysis shows that using either analysis method the relative combined standard uncertainty (k = 1) in determining the thermodynamic temperature in the temperature range from 20 mK to 200 mK is below 0.5%. In this temperature range, both analysis methods produced temperature estimates that deviated from 0.39% to 0.67% from the reference temperatures provided by a superconducting reference point device calibrated against the Provisional Low Temperature Scale of 2000.
    Original languageEnglish
    Pages (from-to)69-76
    JournalMetrologia
    Volume54
    Issue number1
    DOIs
    Publication statusPublished - 1 Feb 2017
    MoE publication typeA1 Journal article-refereed

    Keywords

    • coulomb blockade
    • curve fitting
    • digital voltmeters
    • numerical methods
    • temperature
    • temperature scales
    • thermodynamics
    • thermoelectricity
    • thermometers
    • cryogenic temperatures
    • electrical measurement
    • measurement and analysis
    • provisional low temperature scale
    • reference temperature
    • relative combined standard uncertainties
    • thermodynamic temperature
    • traceability
    • coulomb blockade thermometry
    • primary thermometer

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