Abstract
An important requirement across a range of sensitive detectors is to determine accurately the energy deposited by the impact of a particle in a small volume. The particle may be anything from a visible photon through to an X-ray or massive charged particle. We have been developing nanobridge Josephson junctions based SQUIDs and nanoSQUID devices covering the entire range of particle detection energies from 1eV to MeV. In this paper we discuss some developments in nanobridge Josephson junctions fabrication using focussed ion beam (FIB) and how these developments impact future applications. We focus on tuning of the transition temperature of a superconducting thin-film absorber, with the aim to match the absorber Tc to the working temperature range of the SQUID and also on using a new Xe FIB to improve Josephson junction and superconducting film quality.
Highlights
If the temperature of the chip is adjusted so that both the SQUID is in its optimum operating range and the absorber is just below its own transition temperature, the absorber is in the regime where the superconducting penetration depth ( ) is a very sensitive function of temperature
Tuning the SQUID-Absorber Transition Temperature For optimal performance of the inductive superconducting transition edge detector (ISTED) calorimeter the Tc of the absorber film should be slightly lower than the Tc of the SQUID itself. This means that the Nb nanobridge SQUID which is usually operated at around 2K below the Tc of pure Nb has an absorber which is still superconducting at the SQUID operating temperature but remains in the region where its penetration depth is still strongly temperature dependent
We have investigated two different methods to ‘tune’ the Tc of the absorber film
Summary
- Intrinsic flux noise level of an rf SQUID involving two Josephson junctionsconnected in series Mao Bo, Dai Yuan-Dong and Wang FuRen. - Fabrication of Ultrasmall High-Quality Bi2Sr2CaCu2O8+ Intrinsic Josephson Junctions Tetsuro Matsumoto, Hiromi Kashiwaya, Hajime Shibata et al. This content was downloaded from IP address 128.41.35.204 on 21/08/2018 at 15:25. Advances in Quantum Transport in Low Dimensional Systems IOP Conf. B Li1,2, T Godfrey, D Cox, T Li1,3, J Gallop, S Galer, A Nisbet, Ed Romans and L Hao1 11National Physical Laboratory, Hampton Rd., Teddington TW11 0LW, UK2 2University of Surrey, Guildford, Surrey GU2 7XH, UK 3London Centre for Nanotechnology, University College London, WC1H 0AH, UK
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