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. Kamarás, C. D. Porter, D. B. Tanner, J. M. Tarascon, W. R. McKinnon, L. H. Greene
DOI 10.1103/PhysRevB.35.8843 · Physical Review B
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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 ε1(ω) caused by the strong phonons.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La1.85Sr0.15CuO4-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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