Publication Details

Evtushinsky, D. V.., Kordyuk, A. A., Borisenko, S. V., Zabolotnyy, V. B., Knupfer, M., Fink, J., Buchner, B., Pan, A. V., Erb, A., Lin, C. & Berger, H. (2006). Unadulterated spectral function of low-energy quasiparticles in Bi2Sr2CaCu2O8+delta. Physical Review B (Condensed Matter and Materials Physics), 74 (17), 172509-1-172509-4.


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 Bi2Sr2CaCu2O8+delta 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 scattering rate ~omega^2 and ~omega^3, above and below Tc, respectively.



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