Oxygen isotope effect on quasiparticle and optical properties in cuprates

E. Schachinger and J. P. Carbotte
Phys. Rev. B 81, 014519 – Published 21 January 2010

Abstract

In a recent nodal direction angular-resolved photoemission spectroscopy (ARPES) study of the renormalized electronic dispersion curves in Bi2Sr2CaCu2O8+δ, small changes in the “kink” structure around 70 meV were observed on O16 to O18 substitution. Based on the Eliashberg equations generalized to include the d-wave symmetry of the superconducting gap, we show that these results are incompatible with predominant coupling to a single oxygen-phonon mode. They can be understood in a model where a peak centered at 60meV comprising of only 10% of the total area under the electron-boson interaction spectral density obtained by a maximum entropy inversion of nodal direction of ARPES data, is assigned to phonons and shifted in energy by the 6% expected for oxygen isotope effect. The remaining background with 90% of the area comes from spin fluctuations. Based on a momentum-averaged electron-boson spectral density recovered from optical scattering-rate data, we study corresponding isotope shifts expected in the optical response.

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  • Received 8 October 2009

DOI:https://doi.org/10.1103/PhysRevB.81.014519

©2010 American Physical Society

Authors & Affiliations

E. Schachinger1,* and J. P. Carbotte2,3

  • 1Institute of Theoretical and Computational Physics, Graz University of Technology, A-8010 Graz, Austria
  • 2Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada N1G 2W1
  • 3The Canadian Institute for Advanced Research, Toronto, Ontario, Canada M5G 1Z8

  • *schachinger@itp.tu-graz.ac.at

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Vol. 81, Iss. 1 — 1 January 2010

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