7 November 2002 Energy scales of the excitations associated with superconductivity: an analysis of the infrared and visible in-plane response of Bi2Sr2CaCu2O8+δ
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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.
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A. F. Santander-Syro, A. F. Santander-Syro, Ricardo P. S. M. Lobo, Ricardo P. S. M. Lobo, Nicole Bontemps, Nicole Bontemps, Z. Z. Konstantinovic, Z. Z. Konstantinovic, Z. Z. Li, Z. Z. Li, H. Raffy, H. Raffy, } "Energy scales of the excitations associated with superconductivity: an analysis of the infrared and visible in-plane response of Bi2Sr2CaCu2O8+δ", Proc. SPIE 4811, Superconducting and Related Oxides: Physics and Nanoengineering V, (7 November 2002); doi: 10.1117/12.455524; https://doi.org/10.1117/12.455524
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