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

R. J. Soulen, Jr.; Deborah Van Vechten

doi:10.1103/PhysRevB.36.239

← Back to search

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

R. J. Soulen, Jr., Deborah Van Vechten

DOI 10.1103/PhysRevB.36.239 · Physical Review B

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

Abstract

We have measured with high accuracy (100 ppm) and high precision (5–10 ppm) the impedance of a rf-driven resistive superconducting quantum interference device (SQUID) as a function of the amplitude and frequency of the radio-frequency (rf) bias, as a function of the current bias, and as a function of several other circuit parameters. We have developed the coupled differential equations for the resistive SQUID and for the rf tank circuit. The fit of the solutions of these equations to the data for nonhysteretic junctions is excellent. We were unable to develop solutions for the hysteretic case and thus simply present examples of typical data obtained in order to illustrate the differences with the nonhysteretic case. The relationship of this study to noise thermometry using resistive SQUID’s is indicated.