Fabrication and measurement of superconducting nanowires

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http://eprints.org/relation/isVolatileVersionOf http://etheses.bham.ac.uk/id/document/2889 http://eprints.org/relation/ispreviewThumbnailVersionOf http://etheses.bham.ac.uk/id/document/2889 http://eprints.org/relation/isVersionOf http://etheses.bham.ac.uk/id/document/2889 archive 4031 disk0/00/00/11/62 2010-11-30 12:06:03 2019-01-17 15:34:01 2011-07-19 16:30:11 thesis show 0 Walliman Dominic Christoph Muirhead Christopher M University of Birmingham Fabrication and measurement of superconducting nanowires unpub TK QC 10col_ephy An investigation was made into techniques that could be employed to produce sub-100nm wide superconducting nanowires. Nanowires of niobium and Y Ba\(_2\)Cu\(_3\)O\(_{7-δ}\) (YBCO) were fabricated in thin films using focused gallium ion beam milling (FIB) to a range of widths (100nm-300nm). A procedure was developed to controllably reduce the wire widths using argon ion beam milling. Milling niobium wires under rotation at 75 degrees to the normal produced wires with width and thickness ∼70nm. The nanowires were cryogenically cooled to 4K and the resistance versus temperature characteristics measured. Nb and YBCO wires exhibited a broadening of the superconducting transition, which fitted reasonably with the theory of thermally activated phase slips. Further analysis of the voltage versus current characteristics of the wires showed behaviour not in agreement with the established theory. Various possible explanations were considered for this, with the conclusion that damage to the wires caused by implantation of gallium was 2010-12 2010-04 graduation eng author unchecked This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder. public 192 University of Birmingham School of Physics and Astronomy d_ph na 2010-12 graduation