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Critical-current suppression in sub-micron intrinsic Josephson junction arrays

Fenton, JC; Korsah, M; Grovenor, CRM; Warburton, PA; (2006) Critical-current suppression in sub-micron intrinsic Josephson junction arrays. In: Weber, HW and Sauerzopf, FM, (eds.) Journal of Physics: Conference Series. (pp. 1114 - 1118). IOP Publishing Ltd: Bristol, UK. Green open access

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Abstract

We present experimental results on intrinsic Josephson junctions fabricated by three-dimensional gallium focussed-ion-beam (FIB) milling in c-axis-oriented Tl2Ba2CaCu2O8 thin films. We report measurements of the dependence of the switching current density of these arrays at 4.2 K upon the junction cross-sectional area A showing strong suppression of the switching current density for junctions with A less than or similar to 1 mu m(2); the switching current extrapolates to zero for A similar to 0.25 mu m(2). We discuss the roles of gallium ion implantation and both thermal and quantum fluctuations in this current suppression. We also present in-situ IV measurements demonstrating the use of a liquid-helium-cooled sample stage in conjunction with the FIB milling.

Type: Proceedings paper
Title: Critical-current suppression in sub-micron intrinsic Josephson junction arrays
Event: 7th European Conference on Applied Superconductivity (EUCAS'05)
Location: Vienna Univ Technol, Vienna, Austria
Dates: 2005-09-11 - 2005-09-15
Open access status: An open access version is available from UCL Discovery
DOI: 10.1088/1742-6596/43/1/271
Publisher version: http://dx.doi.org/10.1088/1742-6596/43/1/271
Language: English
Additional information: This work is licensed under a Creative Commons Attribution 3.0 Unported License (http://creativecommons.org/licenses/by/3.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Keywords: Fabrication
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: https://discovery.ucl.ac.uk/id/eprint/152804
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