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Physical Review Letters

Frequency-Pulling Effects in Josephson Radiation

D. E. McCumber

Published Nov 24, 1969• 16 citations
Publisher

Abstract

Contrary to recent suggestions, cavity detuning per se does not modify the Josephson relation ${\ensuremath{\omega}}_{J}(V)=2e\frac{V}{\ensuremath{\hbar}}$, although it can produce measurable differences between the electrostatic and electrochemical potentials in a Josephson junction.

DOI
10.1103/physrevlett.23.1228

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Superconductor Science and Technology•May 1, 1994•6 citations
Contrary to recent suggestions, cavity detuning per se does not modify the Josephson relation \ensuremathωJ(V)=2eV\ensuremathℏ{\ensuremath{\omega}}_{J}(V)=2e\frac{V}{\ensuremath{\hbar}}\ensuremathωJ​(V)=2e\ensuremathℏV​, although it can produce measurable differences between the electrostatic and electrochemical potentials in a Josephson junction.
We have investigated the Josephson radiation from different types of YBa 2 Cu 3 O 7 (YBCO) thin-film Josephson junctions: step-edge junctions (SEJs), biepitaxial junctions and SNS junctions with N=Au. The radiation was detected using a non-resonant radiometer system with a receiving frequency of 11-12 GHz. The current-voltage characteristics were measured simultaneously with the radiation spectra in the temperature range 4.2-90 K. All junctions exhibited a large emission peak at a voltage which was related to the frequency through the second Josephson relation. Typically, for high temperatures, and therefore small critical currents, the measured radiation linewidth agreed well with the theoretical predictions. At lower temperatures the experimental linewidths deviated from the theoretical values due to additional noise sources in the junctions. Some of the SEJs showed a non-monotonic dependence of the linewidth on temperature. It is suggested that such SEJ data may be discussed in terms of a model which treats the SEJ as an interferometer consisting of a parallel array of random Josephson junctions.