Probing the Superconducting Gap of Lead With Ballistic Phonons
Head, Timothy Lawrence
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https://hdl.handle.net/2142/80561
Description
Title
Probing the Superconducting Gap of Lead With Ballistic Phonons
Author(s)
Head, Timothy Lawrence
Issue Date
2007
Doctoral Committee Chair(s)
Dale Van Harlingen
Department of Study
Physics
Discipline
Physics
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Physics, Condensed Matter
Language
eng
Abstract
The assumption that quasiparticles are all in thermal equilibrium with the helium-bath leads to erroneous results for temperature dependences of phonon absorption. Instead, we assume that the phonon-imaging experiment creates small regions of raised temperature that contribute non-equilibrium quasiparticles to the system. Accounting for these quasiparticles, we extract consistent values of both the superconducting energy gap parameter and the superconducting phonon absorption coefficient for all phonon-imaging data. Measured values of the energy gap (Delta = 1.32+/-0.07 meV)are consistent with accepted values from tunneling measurements. Phonon imaging experiments do not support the existence of an SDW ground state in Pb.
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