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1 October 1990 Infrared spectra and the energy gap in thin film YBa2Cu3O7-delta
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Interpretations of IR and millimeter wave measurements in superconductors are generally carried out in terms of the Mattis-Bardeen calculations, which apply either to the anomalous skin effect regime or to the dirty limit regime. In high temperature superconductors neither limit applies. Reflectance measurements on high quality, epitaxially-grown, laser-deposited films indicate that these samples are in the clean-limit, normal skin effect regime. Features that have been previously identified as the gap appear in both the superconducting and the normal-state spectra, although obscured by the free carrier absorption above Tc. Below Tc these features become more evident as the free carrier contribution condenses into a delta function at zero frequency.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Steven Lynn Herr, K. Kamaras, Charles D. Porter, Nacira Tache, David B. Tanner, Shahab Etemad, T. Venkatesan, Eugene W. Chase, Arun Inam, Xin Di Wu, M. S. Hegde, and Barundeb Dutta "Infrared spectra and the energy gap in thin film YBa2Cu3O7-delta", Proc. SPIE 1292, Superconductivity Applications for Infrared and Microwave Devices, (1 October 1990);

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