Issue |
Europhys. Lett.
Volume 62, Number 4, May 2003
|
|
---|---|---|
Page(s) | 568 - 574 | |
Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
DOI | https://doi.org/10.1209/epl/i2003-00388-9 | |
Published online | 01 May 2003 |
Pairing in cuprates from high-energy electronic states
1
Laboratoire de Physique du Solide, CNRS UPR
5 Ecole Supérieure de Physique et Chimie Industrielles de la
Ville de Paris 75231 Paris cedex 5, France
2
Laboratoire de Physique des Solides, CNRS UMR 8502,
Université Paris-Sud 91405 Orsay cedex, France
Corresponding author: Nicole.Bontemps@espci.fr
Received:
22
July
2002
Accepted:
19
March
2003
The in-plane optical conductivity of
films with small
carrier density (underdoped) up to large carrier density
(overdoped) is derived from accurate reflectivity data.
Integrating the conductivity up to increasingly higher
frequencies yields the energy scale involved in the formation of
the condensate. At least in the underdoped sample, states
extending up to 2
contribute to the superfluid. This
anomalously large energy scale may be assigned to a change of
in-plane kinetic energy at the superconducting transition,
and is compatible with an electronic pairing mechanism.
PACS: 74.25.-q – Properties of type I and type II superconductors / 74.25.Gz – Optical properties / 74.72.Hs –
-based cuprates
© EDP Sciences, 2003
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