Far-infrared reflectivity of La2-xSrxCuO4

G. A. Thomas, A. J. Millis, R. N. Bhatt, R. J. Cava, E. A. Rietman

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22 Scopus citations


We have measured and modeled the far-infrared reflectivity of La2-xSrxCuO4 for x=0.175 in the normal and superconducting states in the frequency range 20 to 350 cm-1. We find a much stronger drop of the reflectivity with increasing frequency below 100 cm-1 than is implied by the dc conductivity. In addition, we observe a resonance of large spectral weight at 250 cm-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 80 cm-1, which can be accounted for in terms of the unusual normal-state properties of the material.

Original languageEnglish (US)
Pages (from-to)736-739
Number of pages4
JournalPhysical Review B
Issue number1
StatePublished - 1987
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics


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