Charge localization and phonon spectra in hole doped La2NiO4

R. J. McQueeney; A. R. Bishop; Ya-Sha Yi; Z. G. Yu

doi:10.1088/0953-8984/12/21/102

Charge localization and phonon spectra in hole doped La2NiO4

Strongly Correlated Electrons 2009-10-31 v1 Superconductivity

Authors: R. J. McQueeney , A. R. Bishop , Ya-Sha Yi , Z. G. Yu

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Abstract

The in-plane oxygen vibrations in La2NiO4 are investigated for several hole-doping concentrations both theoretically and experimentally via inelastic neutron scattering. Using an inhomogeneous Hartree-Fock plus RPA numerical method in a two-dimensional Peierls-Hubbard model, it is found that the doping induces stripe ordering of localized charges, and that the strong electron-lattice coupling causes the in-plane oxygen modes to split into two subbands. This result agrees with the phonon band splitting observed by inelastic neutron scattering in La2-xSrxNiO4. Predictions of strong electron-lattice coupling in La2NiO4, the proximity of both oxygen-centered and nickel-centered charge ordering, and the relation between charged stripe ordering and the splitting of the in-plane phonon band upon doping are emphasized.

Keywords

charge localization phonon spectra stripe ordering electron-lattice coupling Peierls-Hubbard model La2NiO4 inelastic neutron scattering

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@article{arxiv.cond-mat/0002097,
  title  = {Charge localization and phonon spectra in hole doped La2NiO4},
  author = {R. J. McQueeney and A. R. Bishop and Ya-Sha Yi and Z. G. Yu},
  journal= {arXiv preprint arXiv:cond-mat/0002097},
  year   = {2009}
}

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4 pages, 3 figures, in RevTeX

Charge localization and phonon spectra in hole doped La2NiO4

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