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Temperature dependence of the penetration depth in the unconventional superconductor Sr2RuO4

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Title: Temperature dependence of the penetration depth in the unconventional superconductor Sr2RuO4
Author(s): Yanoff, Brian David
Doctoral Committee Chair(s): Van Harlingen, D. J.
Department / Program: Physics
Discipline: Physics
Degree: Ph.D.
Genre: Dissertation
Subject(s): strontium ruthenate superconductors
Abstract: 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.
Issue Date: 2000
Genre: Dissertation / Thesis
Type: Text
Language: English
Rights Information: ©2000 Brian David Yanoff
Date Available in IDEALS: 2012-05-31
Identifier in Online Catalog: 4328660

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