New PDF release: Applied Superconductivity

By Vernon Newhouse (Eds.)

ISBN-10: 0125177011

ISBN-13: 9780125177016

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Sample text

18. A consequence of the theory is that the power in the iVth harmonic of an iV-order oscillation should be equal to the power from the N = 1 Josephson oscillation, or ΡΝ,Ν = -Pi. It must be remembered that the detector frequency is fixed at ω0; hence the fundamental frequency ω# of the iV-order oscillation must be set so that the iVth harmonic falls at ωο, or ΝωΝ = ω0. We have experimentally confirmed the equality ΡΝ,Ν = Pi for N as large as 15. 1. 52/iV POINT CONTACT SECTION A FIG. 17b. 45 GHz using the resistive device of Fig.

35 JOSEPHSON WEAK-LINK DEVICES -SUPERCONDUCTING POINT CONTACT RECTIFIED V, RECTIFIER FIG. 15. Schematic representation of the resistive loop oscillator circuit. flux such that αΦχ/dt = V0. In other words, the behavior of the resistive loop device was predictable in detail from the experimental knowledge of the superconducting loop devices that had been studied previously. The solution has already been given, Eq. (44), for the response of a tunnel junction, internally shunted by a constant conductance, to a constant current.

The insulating barrier was formed by a glow discharge in a lowpressure, 10"2 to 10~4 Torr, oxygen atmosphere. It is this part of the process, along with the fact that both the sides and the edges of the junction are sealed against atmospheric effects, which is unique and may be responsible for the long-term reliability of the junction. Any model of what happens at the Pb surface during the glow discharge must be regarded as tentative, but it appears that the energetic atomic or molecular species produced by the glow discharge lead to relatively stable Pb^O^ compounds, as compared to those formed by exposure to a passive oxygen atmosphere at room temperature.

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Applied Superconductivity by Vernon Newhouse (Eds.)


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