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Unadulterated spectral function of low energy quasiparticles: Bi-2212, nodal direction

D. V. Evtushinsky·A. A. Kordyuk·S. V. Borisenko·V. B. Zabolotnyy·M. Knupfer·J. Fink·B. Buechner·A. V. Pan·A. Erb·C. T. Lin·H. Berger
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Abstract

Fitting the momentum distribution photoemission spectra to the Voigt profile appears to be a robust procedure to purify the interaction effects from the experimental resolution. In application to Bi-2212 high-Tc cuprates, the procedure reveals the true scattering rate at low binding energies and temperatures, and, consequently, the true value of the elastic scattering. Reaching the minimal value ~ 16 meV, the elastic scattering does not reveal a systematic dependence on doping level, but is rather sensitive to impurity concentration, and can be explained by the forward scattering on out-of-plane impurities. The inelastic scattering is found to form well-defined quasiparticles with the quadratic and cubic energy dependence of the scattering rate above and below Tc, respectively. The observed energy-temperature asymmetry of the scattering rate is also discussed.

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D. V. Evtushinsky, A. A. Kordyuk, S. V. Borisenko, V. B. Zabolotnyy, M. Knupfer, J. Fink, B. Buechner, A. V. Pan, A. Erb, C. T. Lin, H. Berger. 2006-05-03. Unadulterated spectral function of low energy quasiparticles: Bi-2212, nodal direction. https://doi.org/10.1103/physrevb.74.172509

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