| | Plots of the imaginary part of the dielectric function, which equals the real part of the optical conductivity divided by frequency, for polarization parallel to the CuO2 planes in La2CuO4 and La1.66Sr0.34CuO4 from experiment (bottom) and from a calculation (top) based on density-functional theory for La2CuO4 [I. I. Mazin, et al, JETP Lett. 47, 113 (1988).], as reported by Uchida et al. [Phys. Rev. B 43, 7942 (1991).]. mazin-uchida.png
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