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Superconductivity of ultra-fine tungsten nanowires grown by focused-ion-beam direct-writing

Li, WX; Fenton, JC; Gu, CZ; Warburton, PA; (2011) Superconductivity of ultra-fine tungsten nanowires grown by focused-ion-beam direct-writing. Microelectronic Engineering , 88 (8) 2636 - 2638. 10.1016/j.mee.2010.12.116. Green open access

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Abstract

The electrical properties of lateral ultra-fine tungsten nanowires, which were grown by focused-ion-beam-induced deposition with 1 pA ion-beam current, were investigated. Temperature-dependent electrical measurements show that the wires are conducting and have a superconducting transition with a transition temperature (T-c) about 5.1 K. Resistance vs. temperature measurements reveal that, with decreasing cross-sectional area, the wires display an increasingly broad superconducting transition. A residual resistive tail extending down to the low-temperature region is found only for the thinnest tungsten nanowire, which is 10 nm thick and 19 nm wide. The logarithm of the residual resistance of this wire appears as two linear sections as a function of temperature, one within 300 mK below T-c and the other extending down to the lowest measuring temperature of 4.26 K. Such features have previously been identified with phase slip processes. Our results are suggestive that the focused-ion-beam technique might be a potential approach to fabricate ultra-thin and ultra-narrow nanowires for the study of superconducting suppression in nanoscale materials and for maskless superconducting device fabrication. (C) 2011 Elsevier B.V. All rights reserved.

Type: Article
Title: Superconductivity of ultra-fine tungsten nanowires grown by focused-ion-beam direct-writing
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.mee.2010.12.116
Publisher version: http://dx.doi.org/10.1016/j.mee.2010.12.116
Language: English
Additional information: NOTICE: this is the author’s version of a work that was accepted for publication in Microelectronic Engineering. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Microelectronic Engineering [VOL. 88, ISSUE 8, (Aug 2011)]. DOI: 10.1016/j.mee.2010.12.116
Keywords: Superconductivity, Nanowire, Focused-ion-beam, Direct-writing
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: http://discovery.ucl.ac.uk/id/eprint/1320286
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