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dc.contributor.advisorAbukay, Doğanen
dc.contributor.authorAlgül, Berrin Pınaren
dc.date.accessioned2014-07-22T13:53:02Z
dc.date.available2014-07-22T13:53:02Z
dc.date.issued2008en
dc.identifier.urihttp://hdl.handle.net/11147/4034
dc.descriptionThesis (Master)--Izmir Institute of Technology, Physics, Izmir, 2008en
dc.descriptionIncludes bibliographical references (leaves: 68-72)en
dc.descriptionText in English; Abstract: Turkish and Englishen
dc.descriptionxi, 72 leavesen
dc.description.abstractA well-controlled, high-yield Josephson junction production process forms the basis of superconducting electronic device and circuit technology. In order to use the Josephson junctions effectively and fabricate them reproducibly, their structural and electrical characterization should be performed.This study concentrates on the fabrication and characterization of high temperature bicrystal grain boundary Josephson junctions fabricated onto 24-dand 30-degree SrTiO3 bicrystal substrates using high quality YBa2Cu3O7-. (YBCO) thin-films.200 nm thick YBCO thin films were deposited using a dc Inverted Cylindrical Magnetron Sputtering technique by investigating the thin film deposition conditions in order to obtain device quality films. The superconducting properties of the thin films were determined by electrical characterizations, consisting of resistance versus temperature and magnetic susceptibility versus temperature measurements. Structural properties were analyzed by Atomic Force Microscope, Scanning Electron Microscope and X-Ray Diffraction.Prepared thin film samples were patterned as bicrystal grain boundary Josephson junctions by standard photolithography and chemical etching processes. The current-voltage characteristics of the Josephson junctions were performed at 77 K under zero and non-zero applied field in magnetically shielded environment. The critical current values (Ic), normal resistance (Rn) and IcRn product of the output signals were determined, and the values were discussed as function of the film growth conditions. The optimization of the Josephson junctions was performed in order to improve both the signal performance and the stability of our devices against thermal cycling.en
dc.language.isoengen
dc.publisherIzmir Institute of Technologyen
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subject.lccQC176.8.T8 A394 2008en
dc.subject.lcshJosephson junctionsen
dc.subject.lcshJosephson effectsen
dc.subject.lcshSuperconductorsen
dc.subject.lcshThin film devicesen
dc.titleFabrication and charcterizarion of superconductor YBCO Josephson junctionsen
dc.typemasterThesisen
dc.contributor.departmentIzmir Institute of Technology. Physicsen
dc.relation.publicationcategoryTezen_US


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