Electronic light scattering in the layered cuprates
Reznik, Dmitry
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https://hdl.handle.net/2142/28688
Description
Title
Electronic light scattering in the layered cuprates
Author(s)
Reznik, Dmitry
Issue Date
1993
Doctoral Committee Chair(s)
Klein, Miles V.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
copper oxide superconductors
eletronic light scattering
Language
en
Abstract
Light scattering studies of copper oxide superconductors and the parent insulator materials were performed. Dynamics of the copper oxygen planes were probed with plane-polarized photons, whereas plane-plane coupling was probed with the photons polarized perpendicular to the layers. In both cases the analysis and proposed
phenomenological models involved an xamination of the inelastic ackground continuum. The room temperature investigations of the dynamics of the copper
oxygen planes revealed strong anisotropy of the electronic scattering and established copper oxygen planes and chains as origins of an intense frequency independent continuum, which dominates light scattering spectra of copper oxide superconductors. Systematic comparison of the Raman intensities at different doping levels established stringent constraints on the theoretical models of the continuum. A detailed study of the temperature dependence of electronic scattering at different doping levels, exposed its highly unconventional properties m the normal as well as m the
superconducting state. Examination of the coupling between the copper oxygen layers with c-axis-polarized photons revealed a resonance enhanced electronic Raman continuum in YBa2Cu307. Its lineshape is consistent with weak inerlayer coupling which rapidly disappears as the oxygen content is reduced. Microscopic origin of the resonance is discussed in detail.
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