The fabrication of PBCO buffered step-edge Josephson junctions

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dc.contributor.advisorPerold, W. J.
dc.contributor.authorVan Staden, Wynand Fourieen_ZA
dc.contributor.otherUniversity of Stellenbosch. Faculty of Engineering. Dept. of Electrical and Electronic Engineering.
dc.date.accessioned2008-01-21T09:04:13Zen_ZA
dc.date.accessioned2010-06-01T08:28:16Z
dc.date.available2008-01-21T09:04:13Zen_ZA
dc.date.available2010-06-01T08:28:16Z
dc.date.issued2007-03en_ZA
dc.descriptionThesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2007.
dc.description.abstractA major challenge in the design and operation of High Temperature Superconducting (HTS) devices is the fabrication of reproducible Josephson junctions with good IcRn products. One objective of this thesis was to fabricate successfully HTS step-edge junctions. This objective necessitated a critical evaluation of the available facilities to provide much needed improvements. These improvements included a newly optimised photolithography process, the incorporation of a three-gridded extraction system into the in-house argon ion mill as well as alterations to the Pulsed Laser Deposition (PLD) system to improve thin film quality. These process modifications finally allowed for the fabrication of novel PrBa2Cu3O7−δ buffered step-edge junctions. These junctions were tested for dc and ac Josephson effects and displayed IcRn products of 1.5 mV at 55 K as well as well-defined Shapiro steps. A second objective was to introduce a high quality thin film deposition system that could produce smooth superconducting films for use in filters and multilayer technology. An Inverted Cylindrical Magnetron system was built and optimised to grow YBa2Cu3O7−δ thin films on MgO (001) substrates. A complete optimisation process of these films are presented by utilising several growth and electrical characterisation methods such as XRD, RBS and AFM.en_ZA
dc.format.extent24942178 bytesen_ZA
dc.format.mimetypeapplication/pdfen_ZA
dc.identifier.urihttp://hdl.handle.net/10019.1/1597
dc.language.isoenen_ZA
dc.subjectDissertations -- Electronic engineeringen
dc.subjectTheses -- Electronic engineeringen
dc.subjectJosephson junctionsen
dc.subjectSuperconductivityen
dc.subjectPhotolithographyen
dc.subject.otherElectrical and Electronic Engineeringen_ZA
dc.titleThe fabrication of PBCO buffered step-edge Josephson junctionsen_ZA
dc.typeThesisen_ZA
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