10 August 1994 Electronic light scattering in oxide superconducting and related materials
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A detailed study of electron Raman scattering (RS) has been carried out in superconducting and insulating YBa2Cu3O6+x single crystals. The spectral redistribution at frequencies (omega) equals 600 cm-1 in different polarizations indicate that the superconducting gap is strongly anisotropic. In the normal (metallic) phase the behavior of the imagery part of the response function R'((omega) ) in the polarization (x'x') corresponds to the model of a marginal Fermi liquid, and in the polarization (x'y') and (zz), this behavior is independent of the temperature. In insulating crystals, R'((omega) ) is independent of the temperature up to T >= 200 K in both polarizations. The studies of two-magnon RS were carried out on YBa2Cu3O6+x crystals with oxygen content near the metal- insulator transition. It was found that the chain oxygen reordering processes strongly influence the two-magnon RS spectrum.
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Ilia I. Tartakovskii, Andrei A. Maksimov, "Electronic light scattering in oxide superconducting and related materials", Proc. SPIE 2158, Oxide Superconductor Physics and Nano-Engineering, (10 August 1994); doi: 10.1117/12.182678; https://doi.org/10.1117/12.182678

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