Abstract
We have measured and modeled the far-infrared reflectivity of La/sub 2-//sub x/Sr/sub x/CuO/sub 4/ for x = 0.175 in the normal and superconducting states in the frequency range 20 to 350 cm/sup -1/. We find a much stronger drop of the reflectivity with increasing frequency below 100 cm/sup -1/ than is implied by the dc conductivity. In addition, we observe a resonance of large spectral weight at ..omega..approx. =250 cm/sup -1/ which is absent or much weaker in the insulating x = 0 compound. Below the superconducting temperature of the x = 0.175 sample we observe an additional sharp feature at approx. =80 cm/sup -1/, which can be accounted for in terms of the unusual normal-state properties of the material.
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