Far-infrared measurement of the gap of the high-Tc superconductor La1.85Sr0.15CuO4-x

D. A. Bonn, J. E. Greedan, C. V. Stager, T. Timusk, M. G. Doss, S. Herr, K. Kamars, C. D. Porter, D. B. Tanner, J. M. Tarascon, W. R. McKinnon, L. H. Greene

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Abstract

We report on far infrared measurements of the energy gap of the high-temperature superconductor La1.85Sr0.15CuO4-x. From the reflectance, measured over a wide range of frequencies, we calculate the optical conductivity. It shows phononlike lines at 239, 355, and 494 cm-1 and a gaplike depression below 140 cm-1. The strong edge seen in reflectance at 50 cm-1, and misidentified by a number of investigators as the energy gap, does not appear in the conductivity. It is due to a zero crossing of 1() caused by the strong phonons.

Original languageEnglish
Pages (from-to)8843-8845
Number of pages3
JournalPhysical Review B
Volume35
Issue number16
DOIs
Publication statusPublished - Jan 1 1987

ASJC Scopus subject areas

  • Condensed Matter Physics

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    Bonn, D. A., Greedan, J. E., Stager, C. V., Timusk, T., Doss, M. G., Herr, S., Kamars, K., Porter, C. D., Tanner, D. B., Tarascon, J. M., McKinnon, W. R., & Greene, L. H. (1987). Far-infrared measurement of the gap of the high-Tc superconductor La1.85Sr0.15CuO4-x. Physical Review B, 35(16), 8843-8845. https://doi.org/10.1103/PhysRevB.35.8843