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We present a detailed analysis of the superconductivity-inducedredistribution of optical spectral weight in Bi2Sr2CaCu2O8 near optimal doping.It confirms the previous conclusion by Molegraaf et al. (Science 66, 2239(2002)), that the integrated low-frequency spectral weight shows an extraincrease below Tc. Since the region, where the change of the integratedspectral weight is not compensated, extends well above 2.5 eV, this transfer iscaused by the transfer of spectral weight from interband to intraband regionand only partially by the narrowing of the intraband peak. We show that theopposite assertion by Boris et al. (Science 304, 708 (2004)) regarding thiscompound, is unlikely the consequence of any obvious discrepancies between theactual experimental data.Comment: ReVTeX, 9 pages, 8 encapsulated postscript figures, several typo's  correcte

physical review. b, condensed matter and materials physics

Temperature-modulation analysis of superconductivity-induced transfer of in-plane spectral weight in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Bi</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Sr</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi mathvariant="normal">Ca</mml:mi><mml:msub><mml:mi mathvariant="normal">Cu</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal…

Temperature-modulation analysis of superconductivity-induced transfer of in-plane spectral weight inBi2Sr2CaCu2