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Proceedings Paper

Energy scales of the excitations associated with superconductivity: an analysis of the infrared and visible in-plane response of Bi2Sr2CaCu2O8
Author(s): A. F. Santander-Syro; Ricardo P. S. M. Lobo; Nicole Bontemps; Z. Z. Konstantinovic; Z. Z. Li; H. Raffy
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Paper Abstract

The ab-plane infrared and visible (3 meV - 3 eV) response of Bi2Sr2CaCu2O8+δ (Bi-2212) thin films (prepared by r.f. sputtering on SrTiO3) has been measured between 300 K and 10 K for different doping levels. In the superconducting state, dramatic differences appear between the underdoped and overdoped regimes regarding the electrodynamics of the formation of the superfluid condensate. In the over-doped regime, the superfluid grows up by removing states from energies below 60 meV. This energy is of the order of a few times the superconducting gap. In this respect, overdoped Bi-2212 exhibits a conventional behavior. In the underdoped regime, states extending up to 2 eV contribute to the superfluid. This anomalously large energy scale may be assigned to a change of electronic kinetic energy at the superconducting transition, and is compatible with an electronic pairing mechanism.

Paper Details

Date Published: 7 November 2002
PDF: 12 pages
Proc. SPIE 4811, Superconducting and Related Oxides: Physics and Nanoengineering V, (7 November 2002); doi: 10.1117/12.455524
Show Author Affiliations
A. F. Santander-Syro, Ecole Superieure de Physique et Chimie Industrielles (France)
Ricardo P. S. M. Lobo, Ecole Superieure de Physique et Chimie Industrielles (France)
Nicole Bontemps, Ecole Superieure de Physique et Chimie Industrielles (France)
Z. Z. Konstantinovic, Univ. Paris-Sud (France)
Z. Z. Li, Univ. Paris-Sud (France)
H. Raffy, Univ. Paris-Sud (France)


Published in SPIE Proceedings Vol. 4811:
Superconducting and Related Oxides: Physics and Nanoengineering V
Ivan Bozovic; Davor Pavuna, Editor(s)

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