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Van Harlingen, Dale J. Yanoff, Brian David 2012-05-31T15:37:05Z 2012-05-31T15:37:05Z 10000-01-01 2000 We have constructed a high resolution tunnel-diode oscillator based measurement system suitable for measuring the temperature dependence of the magnetic penetration depth of superconductors, λ(T), at very low temperatures. I report on measurements of λ(T) in high quality single crystals of the perovskite superconductor Sr2RuO4 down to 0.04 K. We observe quadratic temperature dependence at low temperatures. There is no sign of the crossover or second phase transition predicted for a multi-band superconductor. We argue that power law behavior is consistent with an energy gap with nodes, and discuss how the observed quadratic dependence can arise from several possible mechanisms. We propose that non-local effects may be more important in determining the temperature dependence than impurity scattering, and are sufficient to explain the deviation from the linear behavior expected for local superconductors with line nodes. These results are inconsistent with the candidate p-wave states predicted by leading theories. Submitted by Elizabeth Kent (eckent2@illinois.edu) on 2012-05-31T15:37:05Z No. of bitstreams: 1 2000_yanoff.pdf: 3541738 bytes, checksum: 0036dad781255ad2d98d5e64a9aeb385 (MD5) Made available in DSpace on 2012-05-31T15:37:05Z (GMT). No. of bitstreams: 1 2000_yanoff.pdf: 3541738 bytes, checksum: 0036dad781255ad2d98d5e64a9aeb385 (MD5) Previous issue date: 2000 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Elizabeth Kent (eckent2@illinois.edu) on 2012-05-31T15:37:05Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:10:22-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: thesis thesis U of I Only 4328660 http://hdl.handle.net/2142/31304 en ©2000 Brian David Yanoff strontium ruthenate superconductors Temperature dependence of the penetration depth in the unconventional superconductor Sr2RuO4 Dissertation / Thesis text Physics Physics University of Illinois at Urbana-Champaign Dissertation Ph.D.