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Constituents of the "kink" in high-Tc cuprates

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

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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A. A. Kordyuk, S. V. Borisenko, V. B. Zabolotnyy, J. Geck, M. Knupfer, J. Fink, B. Buechner, C. T. Lin, B. Keimer, H. Berger, Seiki Komiya, Yoichi Ando. 2005-10-27. Constituents of the "kink" in high-Tc cuprates. https://doi.org/10.1103/physrevlett.97.017002

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