Constituents of the "kink" in high-Tc cuprates

Kordyuk, A. A.; Borisenko, S. V.; Zabolotnyy, V. B.; Geck, J.; Knupfer, M.; Fink, J.; Buechner, B.; Lin, C. T.; Keimer, B.; Berger, H.; Komiya, Seiki; Ando, Yoichi

Constituents of the "kink" in high-Tc cuprates

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Description

Applying the Kramers-Kronig consistent procedure, developed earlier, we investigate in details 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. 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 T* and sharpening below Tc, and is the main responsible for the formation of the kink in question.
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