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Detection at Radio Frequencies by Superconductivity

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4 Author(s)
J. V. Lebacqz ; Johns Hopkins University, Baltimore, Md. ; C. W. Clark ; M. C. Williams ; D. H. Andrews

Detection of radio-frequency currents by superconducting columbium nitride has been studied as a function of rf current, bias current, and temperature. The existence of nonlinear resistance in the zone between super and normal conduction has been observed, with specially high values of dR/dI for currents less than one ma; this is believed to be due to the effect of the magnetic field of the current superconductivity (Silsbee hypothesis). The observed values of dR/dI account in a rough quantitative way for the observed rectified potentials and their variation with rf current, bias current, and temperature at 1 Mc. Increasing rectification at higher frequencies is observed, but not yet explainable.

Published in:

Proceedings of the IRE  (Volume:37 ,  Issue: 10 )