Phys. Rev. Lett. 97, 017002 (2006) [4 pages]Constituents of the Quasiparticle Spectrum Along the Nodal Direction of High-Tc CupratesReceived 27 October 2005; published 6 July 2006 Applying the Kramers-Kronig consistent procedure, developed earlier, we investigate in detail the formation of the quasiparticle spectrum along the nodal direction of high-Tc cuprates. The heavily discussed “70 meV kink” on the renormalized dispersion exhibits a strong temperature and doping dependence when purified from structural effects such as bilayer splitting, diffraction replicas, etc. This dependence is well understood in terms of fermionic and bosonic constituents of the self-energy. The latter follows the evolution of the spin-fluctuation spectrum, emerging below some doping dependent temperature and sharpening below Tc, and is mainly responsible for the formation of the kink in question. © 2006 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.97.017002
DOI:
10.1103/PhysRevLett.97.017002
PACS:
74.25.Jb, 71.15.Mb, 74.72.Hs, 79.60.−i
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