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Spin Transport and Nonequilibrium Superconductivity in YBa2Cu3O7-δ


Huang, Zhao (2000) Spin Transport and Nonequilibrium Superconductivity in YBa2Cu3O7-δ. Senior thesis (Major), California Institute of Technology. doi:10.7907/X0B4-8905.


Our studies of YBa2Cu3O7-δ under the injection of spin-polarized quasi-particles have yielded new spin transport information along the c-axis as well as signatures of non-equilibrium effects. We have found a surprisingly strong divergence of the spin diffusion lengths at the transition temperature Tc which suggests a new model for the suppression of the critical current Ic under the influence of excess spin. We have discovered at low temperatures quasiparticle distribution effects due to the perturbation of an external injection. We report preliminary results for the search for "preformed" Cooper pairs above Tc. And finally we present initial spin injection transport studies in a microwave background from which we can estimate an upper bound on the electron-phonon scattering time and Cooper pair recombination time in YBCO.

Item Type:Thesis (Senior thesis (Major))
Subject Keywords:Physics
Degree Grantor:California Institute of Technology
Division:Physics, Mathematics and Astronomy
Major Option:Physics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Yeh, Nai-Chang
Defense Date:2000
Record Number:CaltechTHESIS:01102018-101757779
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:10629
Deposited By: Joy Painter
Deposited On:10 Jan 2018 23:56
Last Modified:21 Dec 2019 03:03

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