University of Illinois Urbana-Champaign

Temperature dependence of the penetration depth in the unconventional superconductor Sr2RuO4

Yanoff, Brian David

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https://hdl.handle.net/2142/31304

Description

Title
Temperature dependence of the penetration depth in the unconventional superconductor Sr2RuO4
Author(s)
Yanoff, Brian David
Issue Date
2000
Doctoral Committee Chair(s)
Van Harlingen, Dale J.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
  • strontium ruthenate
  • superconductors
Language
en
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.
Type of Resource
text
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http://hdl.handle.net/2142/31304
Copyright and License Information
©2000 Brian David Yanoff

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