Abstract
The reflectance spectra of polycrystalline La2−x Sr x CuO4 samples were investigated in the energy range between 50 meV and 4 eV in dependence of the Sr content. The spectra are attributed to free carrier absorption of the Drude type, superimposed by optical phonon excitations below 0.1 eV and intrinsic absorption above 1 eV. From the influence of Sr doping onto the plasma energy it is deduced that La2−x Sr x CuO4 is ap-type conductor with a maximum carrier concentration of 2.0×1021 cm−3 forx=0.15. The results are interpreted in terms of a Hubbard model with an empty upper and ap-doped lower Hubbard band with a width of 1.9 eV.
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Geserich, H.P., Sack, D., Scheiber, G. et al. Influence of Sr doping on the free carrier absorption in high-T c superconductors La2−x SrxCuO4 . Z. Physik B - Condensed Matter 69, 465–469 (1988). https://doi.org/10.1007/BF01312507
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DOI: https://doi.org/10.1007/BF01312507