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We apply the new-generation ARPES methodology to the most widely studiedcuprate superconductor YBCO. Considering the nodal direction, we foundnoticeable renormalization effects known as "kinks" both in the quasiparticledispersion and scattering rate, the bilayer splitting and evidence for stronginterband scattering -- all the characteristic features of the nodalquasiparticles detected earlier in BSCCO. The typical energy scale and thedoping dependence of the "kinks" clearly point to their intimate relation withthe spin-1 resonance seen in the neutron scattering experiments. Our findingsstrongly suggest a universality of the electron dynamics in the bilayersuperconducting cuprates and a dominating role of the spin-fluctuations in theformation of the quasiparticles along the nodal direction.Comment: 4.5 RevTeX pages, 4 eps figure

physical review letters

Kinks, Nodal Bilayer Splitting, and Interband Scattering in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>YBa</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Cu</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mrow><mml:mn>6</mml:mn><mml:mo>+</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:math>

Kinks, Nodal Bilayer Splitting, and Interband Scattering inYBa2Cu3O6+x