Charge localization and phonon spectra in hole doped La2NiO4

Details Charge localization and phonon spectra in hole doped La2NiO4 Charge localization and phonon spectra in hole doped La2NiO4

2000-02-07

arxiv.org/abs/cond-mat/0002097v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures, in RevTeX

Scientific paper

10.1088/0953-8984/12/21/102

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.

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