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Resonant two-magnon Raman scattering in high-Tc cuprates


  • I. Kupčić

    Corresponding author
    1. Department of Physics, Faculty of Science, University of Zagreb, HR-10002 Zagreb, Croatia
    • Department of Physics, Faculty of Science, POB 331, HR-10002 Zagreb, Croatia.
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Resonance enhancement of one-phonon, two-phonon, and two-magnon Raman scattering in a general, exactly solvable, multiband model is explained in a way that is in accordance with the general analytical properties of the total optical conductivity tensor. Using this approach, the charge-transfer limit of the Emery three-band model is examined to explain resonance enhancement of the two-magnon Raman spectra of high-Tc cuprates, which is found in experiments to be of 3 orders of magnitude. While previous Raman and optical conductivity analyzes of the cuprates, based on the single-band Hubbard model, are found to be consistent with the picture where one hole per one CuO2 unit is localized on the Cu ion, the present three-band approach allows the study of the opposite, strong copper-oxygen hybridization limit, which is found to be in agreement with the results of nuclear magnetic resonance (NMR) and one-phonon Raman scattering experiments. Copyright © 2010 John Wiley & Sons, Ltd.