University of Illinois Urbana-Champaign

Nuclear magnetic resonance studies of the effect of vortices on the high temperature superconductor YBa2̳Cu3̳O7̳

Milling, Craig Thomas

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https://hdl.handle.net/2142/31319

Description

Title
Nuclear magnetic resonance studies of the effect of vortices on the high temperature superconductor YBa2̳Cu3̳O7̳
Author(s)
Milling, Craig Thomas
Issue Date
2001
Doctoral Committee Chair(s)
Slichter, C.P.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
  • nuclear magnetic resonance
  • superconductors
  • magnetic vortices
  • YBa2̳Cu3̳O7̳
  • Volovik Effect
Language
en
Abstract
Nuclear Magnetic Resonance in the material YBa2Cu307 is strongly affected by the presence of magnetic vortices. The effects produced by the vortices can be used to gain knowledge about the physics of vortices and the physics of these materials. NMR nutation curves show that the vortices produce lossy (Ohmic) conduction in this material and greatly enhance the penetration depth over the London value. This enhancement is necessary to study crystal samples. The vortices induce supercurrents in the material which in turn enhance the density of states at the Fermi level. This enhancement,known as the Volovik Effect, can be observed in NMR as an increase in the spin-lattice relaxation rate as a function of frequency across the resonance line. The Volovik Effect was observed in both copper and oxygen in the plane of YBa2CU307. The Volovik Effect was not able to be observed with sufficient precision to discriminate between various theories because it was obscured by other physical mechanisms within the sample studied.
Type of Resource
text
Permalink
http://hdl.handle.net/2142/31319
Copyright and License Information
©2001 Milling

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