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Recent Results of the e/h-measurement at PTB

  • V. Kose
  • F. Melchert
  • H. Fack
  • P. Gutmann
Conference paper

Abstract

It has been shown by several experimentalists (1, ... ,4) that the steplike current-voltage characteristic based on the Josephson voltage-frequency relation can be used to determine the fundamental physical constant e/h with high accuracy. This frequency-voltage relation is as far as we know from various experiments, independent of influences such as temperature, type of junction, superconducting material, magnetic field,step number, microwavepower, and so on. So it seems that the Josephson effect provides the most reliable method of maintaining the volt.

Keywords

Standard Cell Josephson Effect Quartz Oscillator Step Amplitude Null Detector 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    FINNEGAN, T. F., DENENSTEIN, A. and LANGENBRG, D. N., Phys. Rev. Letters 24, 738 (1970).ADSCrossRefGoogle Scholar
  2. 2.
    PETLEY, B. W. and GALLOP, J. C., in Proceedings ofthe International Conference on Precision Measurement and Fundamental Constants, edited by D.N.Langenberg and B. N. Taylor (National Bureauof Standards Special Publication 343, U.S. Government Printing Office, Washington, DC, 1971) p. 147.Google Scholar
  3. 3.
    HARVEY, I. K., MACFARLANE, J. C. and FRENKEL, R. B.,Phys. Rev. Letters 25, 853 (1970).ADSCrossRefGoogle Scholar
  4. 4.
    KOSE, V., MELCHERT, F., FACK, H. and SCHRADER, H.-J.,PTB-Mitt. 81, 8 (1971).Google Scholar
  5. 5.
    FACK, H., KOSE, V. and SCHRADER, H.-J.,Mcβtechnik 79, 31 (1971).Google Scholar

Copyright information

© Plenum Publishing Company Ltd 1972

Authors and Affiliations

  • V. Kose
    • 1
  • F. Melchert
    • 1
  • H. Fack
    • 1
  • P. Gutmann
    • 1
  1. 1.Electricity DivisionPhysikalisch-Technische BundesanstaltBraunschweigGermany

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