Abstract
A simplified model for YBa2Cu3O7 system composed of CuO2 layers and Cu−O chains has been calculated with the long range effect of the all-neighbors Coulombice-e interactions taken into consideration. Dispersion relations have been worked out and discussed. The most striking consequence from the all-neighbors interaction is that the plasmons have, in the long wavelength limit, in addition to the usual vanishingly small two-dimensional acoustic plasmon energies which result from only nearest neighbor interactions, a non-zeroω *P consistent with the bulk plasma frequency of a three dimensional system. The data of an optical reflectance from an EELS experiment has been refitted based on calculated results for plasmon dispersion relations in the YBa2Cu3O7 system.
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Tsay, SF., Wang, SY. & Yang, T.J.W. The dispersion relations of plasmons in a simplified system of CuO2 layers and Cu−O chains. Z. Physik B - Condensed Matter 88, 255–260 (1992). https://doi.org/10.1007/BF01470910
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DOI: https://doi.org/10.1007/BF01470910