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

Research output: Contribution to journalArticlepeer-review


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 (US)
Pages (from-to)8843-8845
Number of pages3
JournalPhysical Review B
Issue number16
StatePublished - 1987

ASJC Scopus subject areas

  • Condensed Matter Physics


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