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Proceedings Paper

Infrared spectra and the energy gap in thin film YBa2Cu3O7-delta
Author(s): 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; Barundeb Dutta
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Paper Abstract

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.

Paper Details

Date Published: 1 October 1990
PDF: 8 pages
Proc. SPIE 1292, Superconductivity Applications for Infrared and Microwave Devices, (1 October 1990); doi: 10.1117/12.21028
Show Author Affiliations
Steven Lynn Herr, Virginia Commonwealth Univ. (United States)
K. Kamaras, Central Research Institute of (Hungary)
Charles D. Porter, Univ. of Florida (United States)
Nacira Tache, Univ. of Florida (United States)
David B. Tanner, Univ. of Florida (United States)
Shahab Etemad, Bell Communications Research (United States)
T. Venkatesan, Bell Communications Research (United States)
Eugene W. Chase, Bell Communications Research (United States)
Arun Inam, Rutgers Univ. (United States)
Xin Di Wu, Rutgers Univ. (United States)
M. S. Hegde, Rutgers Univ. (United States)
Barundeb Dutta, Rutgers Univ. (Belgium)


Published in SPIE Proceedings Vol. 1292:
Superconductivity Applications for Infrared and Microwave Devices
Kul B. Bhasin; Vernon O. Heinen, Editor(s)

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