| Автор | R J McQueeney |
| Автор | A R Bishop |
| Автор | Ya-Sha Yi |
| Автор | Z G Yu |
| Дата выпуска | 2000-05-29 |
| dc.description | The in-plane oxygen vibrations in La<sub>2</sub>NiO<sub>4</sub> are investigated for several hole-doping concentrations both theoretically and experimentally via inelastic neutron scattering. Using an inhomogeneous Hartree-Fock plus random-phase approximation 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 La<sub>2-x</sub>Sr<sub>x</sub>NiO<sub>4</sub>. Predictions of strong electron-lattice coupling in La<sub>2</sub>NiO<sub>4</sub>, the proximity of both oxygen-centred and nickel-centred charge ordering, and the relation between charged stripe ordering and the splitting of the in-plane phonon band upon doping are emphasized. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Charge localization and phonon spectra in hole-doped La<sub>2</sub>NiO<sub>4</sub> |
| Тип | lett |
| DOI | 10.1088/0953-8984/12/21/102 |
| Electronic ISSN | 1361-648X |
| Print ISSN | 0953-8984 |
| Журнал | Journal of Physics: Condensed Matter |
| Том | 12 |
| Первая страница | L317 |
| Последняя страница | L322 |
| Выпуск | 21 |
