Unadulterated spectral function of low-energy quasiparticles in Bi2Sr2CaCu2O8+δ

D. V. Evtushinsky, A. A. Kordyuk, S. V. Borisenko, V. B. Zabolotnyy, M. Knupfer, J. Fink, B. Büchner, A. V. Pan, A. Erb, C. T. Lin, and H. Berger
Phys. Rev. B 74, 172509 – Published 29 November 2006

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 Bi2Sr2CaCu2O8+δ 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 16meV, 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 ω2 and ω3, above and below Tc, respectively.

    • Received 27 September 2006

    DOI:https://doi.org/10.1103/PhysRevB.74.172509

    ©2006 American Physical Society

    Authors & Affiliations

    D. V. Evtushinsky1, A. A. Kordyuk1,2, S. V. Borisenko2, V. B. Zabolotnyy2, M. Knupfer2, J. Fink2, B. Büchner2, A. V. Pan3, A. Erb4, C. T. Lin5, and H. Berger6

    • 1Institute of Metal Physics of National Academy of Sciences of Ukraine, 03142 Kyiv, Ukraine
    • 2IFW Dresden, P.O. Box 270116, D-01171 Dresden, Germany
    • 3ISEM, University of Wollongong, Wollongong, NSW 2522, Australia
    • 4Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany
    • 5Max-Planck Institut für Festkörperforschung, 70569 Stuttgart, Germany
    • 6Institut de Physique de la Matiére Complexe, EPFL, 1015 Lausanne, Switzerland

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    Issue

    Vol. 74, Iss. 17 — 1 November 2006

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