Pinch resonances in a radio-frequency driven SQUID ring-resonator system

Prance, H, Clark, T D, Whiteman, R, Prance, R J, Everitt, M, Stiffell, P and Ralph, J F (2001) Pinch resonances in a radio-frequency driven SQUID ring-resonator system. Physical Review E, 64 (1). 016208-1. ISSN 1063-651X

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In this paper we present experimental data on the frequency domain response of a SQUID ring (a Josephson weak link enclosed by a thick superconducting ring) coupled to a radio frequency (rf) tank circuit resonator. We show that with the ring weakly hysteretic the resonance lineshape of this coupled system can display opposed fold bifurcations that appear to touch (pinch off). We demonstrate that for appropriate circuit parameters these pinch off lineshapes exist as solutions of the non-linear equations of motion for the system.

Item Type: Article
Additional Information: This paper reports results of my experimental work which, over a number of years, has been concerned with nonlinear and macroscopic quantum effects in RF SQUIDs, including under my EPSRC New Lecturer Grant GR/N32266/01. These devices have long been of interest both as ultra-sensitive magnetometers and, latterly, as potential candidates for quantum technologies. Their extreme non-linearity presents both advantages and difficulties in these applications and a clear understanding of the behaviour is vital for design and exploitation of the devices. This work contributed to a successful application for £200k SRIF funding of an ultra-low temperature facility at Sussex.
Schools and Departments: School of Engineering and Informatics > Engineering and Design
Depositing User: Helen Prance
Date Deposited: 06 Feb 2012 21:11
Last Modified: 02 Jul 2019 22:45

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