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Review of Scientific Instruments

An Adjustable rf-Biased SQUID

D. M. Strayer, R. M. Catchings, Tom Oversluizen, T. A. Kitchens

Published Sep 1, 1973• 0 citations
Publisher

Abstract

A symmetric rf-biased point-contact superconducting quantum interference device, which can be adjusted while in operation at low temperatures, is described. The device retains the inherent stability and other features of the symmetric rf-biased SQUID while increasing its flexibility, reliability, and even convenience with a simple adjustment feature.

DOI
10.1063/1.1686415

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A symmetric rf-biased point-contact superconducting quantum interference device, which can be adjusted while in operation at low temperatures, is described. The device retains the inherent stability and other features of the symmetric rf-biased SQUID while increasing its flexibility, reliability, and even convenience with a simple adjustment feature.
In Chapter 2 we made use of a hypothetical arrangement of a strongly coupled superconducting ring, interrupted by a region of weak superconductivity, to derive the essential features of the Josephson effects. In practice this same arrangement is actually employed as the basis of one of the most useful superconducting devices developed so far, the single-junction, or rf, squid . (As mentioned in the Introduction, squid is an acronym for Superconducting QUantum Interference Device.) Here the essential physics behind the operation of these important devices will be described, and in the following section the practical realisation of an rf squid with its associated readout electronics will be explained. Chapter 4 will treat in a similar way dc squid s, which are related devices possessing two weak links in a single ring, whose mode of operation is rather different.
Point-contact devices are described which have exhibited long-term stability and reliability. A particular mode of operation of the devices as rf-biased low-frequency detectors is described in detail, including a description of how the device drives a resonant circuit to which it is coupled. In this mode of operation the sensitivity of the devices to low-frequency fields is of the order of 10−9 G per root cycle bandwidth. Perfectly clean contacts were made by breaking a notched niobium member at 4.2°K and then remaking contact at the break. Quantum behavior of such contacts is identical to that of ordinary contacts, but effects of microscopic multiple connections at the contact were not observed.