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Experimental studies of the electronic structure remain the basic means forunderstanding the nature of high-temperature superconductivity (HTSC) andtesting relevant theoretical models. Appreciable contributions to establish theoverall picture in HTSC have recently been made by investigations on the chargedynamics in BSCCO (ref. 1) and the spin dynamics in YBCO, using Angle ResolvedPhotoemission Spectroscopy (ARPES) and Inelastic Neutron Scattering (INS),respectively. Concentration of each of these techniques on a "suitable"compound turns out to be a barrier on the way to a crucial quantitative testallowing to support or discard spin fluctuations (interaction between thecharge and spin degrees of freedom) as a possible origin for the pairing indoped cuprates. Here we solve the long-standing puzzle of ARPES on YBCO byshowing that the photoelectron spectrum of YBCO generally includes twocomponents: One from the topmost anomalously overdoped metallic CuO2 bilayerand the other from the next superconducting bilayer that retains the bulkproperties. Our findings clearly show the opening of a large superconductinggap and, for the first time, demonstrate the anisotropic renormalization in thebulk component of YBCO, supporting the universality of these effects fordifferent cuprate families. With our study we re-open this cuprate family fornew systematic ARPES investigations.Comment: 4 pages, 3 figure

physical review. b, condensed matter and materials physics

Momentum and temperature dependence of renormalization effects in the high-temperature superconductor<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Y</mml:mi><mml:msub><mml:mi mathvariant="normal">Ba</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Cu</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mrow><mml:mn>7</mml:mn><mml:mo>−</mml:mo><mml:mi>δ</mml:mi></…

Momentum and temperature dependence of renormalization effects in the high-temperature superconductorYBa2Cu3O7−δ