Abstract
We have measured the reflectance of superconducting iron-doped YBaCuO ceramics in the frequency range from 20 to 10000 cm−1 for various temperatures above and belowT c . In these spectra we could directly observe an energy gap. A Kramers-Kronig analysis was performed. We discuss the temperature dependence of two infrared-active phonons and an absorption band located around 500 cm−1.
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Seider, E., Bauer, M., Genzel, L. et al. FIR-spectroscopy on iron-doped YBaCuO ceramics: energy gap, phonons and a band at 500 cm−1 . Z. Physik B - Condensed Matter 83, 1–5 (1991). https://doi.org/10.1007/BF01314390
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DOI: https://doi.org/10.1007/BF01314390