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Van Harlingen, Dale J. Hilliard, Joseph Edward, Jr. 2015-09-25T20:02:36Z 2015-09-25T20:02:36Z 10000-01-01 2001 2001 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. Made available in DSpace on 2015-09-25T20:02:36Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 3023072.pdf: 5962699 bytes, checksum: 1b4428db738a35ce90eb260ef5068e0e (MD5) Previous issue date: 2001 Embargo set by: Seth Robbins for item 81751 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs U of I Only 136 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2001. http://hdl.handle.net/2142/80469 (MiAaPQ)AAI3023072 eng Physics, Condensed Matter Conductivity and Interferometry Experiments on YBCO/lead Ramp-Edge Josephson Junctions text Dissertation Physics Physics University of Illinois at Urbana-Champaign Ph.D.