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                <forename type="first">A.F.</forename>
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            <funder>Departamento Administrativo de Ciencia, Tecnología e Innovación (COLCIENCIAS)</funder>
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            <idno type="stamp" n="UNIV-PARIS-SACLAY">Université Paris-Saclay</idno>
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                <term xml:lang="en">electricity</term>
                <term xml:lang="en">bismuth derivative</term>
                <term xml:lang="en">strontium</term>
                <term xml:lang="en">accuracy</term>
                <term xml:lang="en">article</term>
                <term xml:lang="en">conductance</term>
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              <p>The in-plane infrared and visible (3 meV-3 eV) reflectivity of Bi 2Sr2CaCu2O8+δ (Bi-2212) thin films is measured between 300 K and 10 K for different doping levels with unprecedented accuracy. The optical conductivity is derived through an accurate fitting procedure. We study the transfer of spectral weight from finite energy into the superfluid as the system becomes superconducting. In the overdoped regime, the superfluid develops at the expense of states lying below 60 meV, which is a conventional energy of the order of a few times the superconducting gap. In the underdoped regime, spectral weight is removed from up to 2 eV, far beyond any conventional scale. The intraband spectral weight change between the normal and superconducting state, if analyzed in terms of a change of kinetic energy, is ∼1 meV. Compared to the condensation energy, this figure addresses the issue of a kinetic-energy driven mechanism.</p>
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