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Title:Conductivity and Interferometry Experiments on YBCO/lead Ramp-Edge Josephson Junctions
Author(s):Hilliard, Joseph Edward, Jr.
Doctoral Committee Chair(s):Van Harlingen, Dale J.
Department / Program:Physics
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Physics, Condensed Matter
Abstract:In this thesis, we study the details of the order parameter symmetry in arbitrary directions of the high-temperature cuprate superconductor YBa 2Cu3O7-y (YBCO) using YBCO/Pb ramp-edge Josephson junctions with lithographically defined corner and straight-edge geometries. Measurements of the critical current versus applied field, I c(H), and the an dynamic conductance, dI/dV, are presented. For junctions with corner geometries, as well as for most of the straight-edge junctions, the known dx2-y2 order parameter symmetry of YBCO is confirmed. For some of the straight-edge junctions oriented near 45° with respect to the YBCO a and b axes, an anomalous temperature dependence of the Ic(H) pattern is found in the range from 5 down to 1.4 K. We consider the onset of a secondary order parameter and the onset of second-order Josephson coupling as possible interpretations of this anomalous temperature dependence and we find the second-order Josephson coupling interpretation more likely.
Issue Date:2001
Description:136 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2001.
Other Identifier(s):(MiAaPQ)AAI3023072
Date Available in IDEALS:2015-09-25
Date Deposited:2001

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