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Goldbart, Paul M. Sheehy, Daniel Edward 2012-06-05T17:40:08Z 2012-06-05T17:40:08Z 10000-01-01 2001 One important clue to understanding the origin of superconductivity in the hightemperature cuprate superconductors lies in the intriguing properties of the global phase diagram of the cuprate materials. In particular, strongly underdoped cuprates exhibit antiferromagnetic order, whereas moderately underdoped cuprate superconductors exhibit a pseudogap in the excitation spectrum above the superconducting transition temperature. It is likely that an understanding of the relationship between antiferromagnetism and superconductivity as well as an understanding of the nature of the pseudogap will be essential to the development of a theory for the cuprate superconductors. In this Thesis we propose experimental tests aimed at assessing the validity of two particular scenarios for the cuprate superconductors. The first scenario which we examine is the phase-fluctuation model of the pseudogap phenomena, which posits that the pseudogap is due to the existence of local phase-incoherent superconducting correlations. We propose and theoretically explore experiments designed to directly probe these correlations. The second scenario which we examine is the SO(5) theory of superconductivity, which attempts to unify the antiferromagnetic and superconducting regions of the phase diagram. We propose and theoretically explore experiments designed to test the SO(5) scenario. Submitted by William Weathers (weathrs2@illinois.edu) on 2012-06-05T17:40:08Z No. of bitstreams: 1 2001_Sheehy.pdf: 3175889 bytes, checksum: d9395b764a9bef17c2fbb254b2765172 (MD5) Made available in DSpace on 2012-06-05T17:40:08Z (GMT). No. of bitstreams: 1 2001_Sheehy.pdf: 3175889 bytes, checksum: d9395b764a9bef17c2fbb254b2765172 (MD5) Previous issue date: 2001 Restriction data tranferred 2014-07-01T11:10:22-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by William Weathers (weathrs2@illinois.edu) on 2012-06-05T17:40:08Z Item is restricted indefinitely. Thesis U of I Only http://hdl.handle.net/2142/31340 4539091 en ©2001 Sheehy superconductors SO(5) cuprate materials Topics in the Theory of High-Temperature Superconductors Dissertation / Thesis text Physics Physics University of Illinois at Urbana-Champaign Dissertation Ph.D.