| Issue |
Europhys. Lett.
Volume 55, Number 6, September II 2001
|
|
|---|---|---|
| Page(s) | 854 - 860 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2001-00360-9 | |
| Published online | 01 December 2003 | |
Pseudo-gap and superconducting condensate
energies in the infrared spectra of Pr-doped 
1
Laboratoire de Physique du Solide, Ecole Supérieure de Physique
et Chimie Industrielles de la Ville de Paris, CNRS UPR 5 -
75231 Paris Cedex 5, France
2
Department of Physics and Astronomy, Tel-Aviv University
Ramat-Aviv, Tel-Aviv, 69978 Israel
Corresponding author: lobo@lure.u-psud.fr
Received:
6
March
2001
Accepted:
29
June
2001
The (a,b)-plane infrared and visible conductivity (30–30000 cm-1)
of a 40% praseodymium-substituting yttrium
film displays a loss of spectral weight over
two separate energy ranges when lowering the temperature. A first
loss of spectral weight is present in the range 300–800 cm-1
from room temperature down to 40 K (
= 35 K). A further
distinct spectral weight diminution appears in the superconducting
phase at frequencies below 200 cm-1. This diminution can be
observed due to the high signal-to-noise ratio allowed by the
large area of the thin film. We propose that the lower energy loss
of spectral weight reflects the formation and the properties of
the superconducting condensate.
PACS: 74.25.Gz – Optical properties / 74.76.Bz – High- films
© EDP Sciences, 2001
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