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Greene, Laura H. Hentges, Patrick Jay 2012-10-13T02:13:19Z 2012-10-13T02:13:19Z 10000-01-01 2004-10 Planar tunnel spectroscopic measurements are performed on YBa2Cu3O7-δ (YBCO) thin films at four different crystallographic orientations. Since tunneling is a highly surface-sensitive probe on YBCO, films have been optimized for high surface quality. To fabricate the tunneling insulator, a novel fabrication technique has been developed through solution condensation and hydrolysis of zirconia, which has proven to be gentler to the surface than previous techniques. The result is a clean tunneling interface as shown in scanning electron microscopy, atomic force microscopy and transmission electron microscopy, that allows us to detect several new features in the tunneling conductance. In addition, we have fabricated tunnel junctions with three different counter-electrode deposition techniques. In doing so, various behaviors of the tunneling conductance and its dependence on magnetic field, temperature, and injected current as a function of these counter-electrode deposition techniques has been observed. Modeling of the tunneling conductance has provided insight into the various behaviors. It has been shown that by varying the value of the tunneling cone, surface faceting and quasiparticle lifetime, in agreement with the observations, splitting vs. non-splitting of the zero-bias conductance peak can be understood. Submitted by Meng Tao (mengtao2@illinois.edu) on 2012-10-13T02:13:19Z No. of bitstreams: 1 Hentges.pdf: 4458908 bytes, checksum: f2a30f3f878b7e26cdd2c8d6edb302b8 (MD5) Made available in DSpace on 2012-10-13T02:13:19Z (GMT). No. of bitstreams: 1 Hentges.pdf: 4458908 bytes, checksum: f2a30f3f878b7e26cdd2c8d6edb302b8 (MD5) Previous issue date: 2004-10 Restriction data tranferred 2014-07-01T11:11:08-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Post 1923. No authorization form. Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Meng Tao (mengtao2@illinois.edu) on 2012-10-13T02:13:19Z Item is restricted indefinitely. Post 1923. No authorization form. U of I Only 5438827 http://hdl.handle.net/2142/34744 en ©2004 Patrick Jay Hentges Superconductors YBCO Thin Film Tunneling Measurements Planar Tunneling and Andreev Bound State Spectroscopy of YBa2Cu3O7- d Thin Films Using Solution-Deposited Zirconia Insulators Dissertation / Thesis text Physics Physics University of Illinois at Urbana-Champaign Dissertation Ph.D.