University of Illinois Urbana-Champaign

Penetration Depth Studies of Unconventional Superconductors

Chia, Ee-Min Elbert

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https://hdl.handle.net/2142/32107

Description

Title
Penetration Depth Studies of Unconventional Superconductors
Author(s)
Chia, Ee-Min Elbert
Issue Date
2004-05
Director of Research (if dissertation) or Advisor (if thesis)
Salamon, Myron B.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
  • Superconductors
  • Superconductivity
  • Quasiparticle Density of States (QDOS)
  • penetration depth
  • rare earth metals
Language
en
Abstract
The magnetic penetration depth λ of various unconventional superconductors have been measured down to ~0.1 K using a tunnel-diode based, self-inductive technique at 21 and 28 MHz. The samples measured are the heavy-fermion superconductors CeCoIn5 and PrOs4Sb12, the rare-earth borocarbides RENi2B2C (RE = Y, Lu, Er, Ho), the spin-triplet superconductor Sr2RuO4, and elemental Pb. From these studies we see how superconductivity is affected by the presence of another order, such as paramagnetism/antiferromagnetism (in ErNi2B2C) or spin-density-wave (in Pb). We also see how the superfluid response is modified by nonlocal corrections in CeCoIn5 and Sr2RuO4. Hints of multi-band superconductivity are seen in YNi2B2C, LuNi2B2C and Sr2RuO4. Finally, we observe point-node behavior in PrOs4Sb12, whose superconductivity is suggested to be non-magnetic in origin - the first of its kind. Various theoretical models have been used to fit the data. Some of the work are still ongoing.
Type of Resource
  • text
  • audio
Permalink
http://hdl.handle.net/2142/32107
Copyright and License Information
© 2004 Ee-Min Elbert Chia

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