| Автор | A P Menushenkov |
| Автор | K V Klementev |
| Дата выпуска | 2000-04-24 |
| dc.description | X-ray absorption spectra of the oxide systems Ba<sub>1 - x </sub> K<sub>x </sub> BiO<sub>3</sub> and BaPbO<sub>3</sub> above the Bi and Pb L<sub>3</sub> absorption edges were investigated. It was shown that oxygen ions move in a double-well potential and their oscillations are correlated with the charge-carrier movement. The observed breathing-like oxygen vibration in the double-well potential with large amplitude and low frequency causes the strong electron-phonon coupling and high T<sub>c</sub> -values for doped BaBiO<sub>3</sub> . Based on the experimental data, a model of the relationship of the electronic and local crystal structures is proposed that is in good agreement with the results from transport measurements, and inelastic neutron and electron scattering, Raman scattering, and photoemission spectroscopy. In the framework of the model, the possible reasons for the superconductivity in perovskite-like oxides are discussed. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Extended x-ray absorption fine-structure indication of a double-well potential for oxygen vibration in Ba<sub>1 - x</sub>K<sub>x</sub>BiO<sub>3</sub> |
| Тип | paper |
| DOI | 10.1088/0953-8984/12/16/303 |
| Electronic ISSN | 1361-648X |
| Print ISSN | 0953-8984 |
| Журнал | Journal of Physics: Condensed Matter |
| Том | 12 |
| Первая страница | 3767 |
| Последняя страница | 3786 |
| Аффилиация | A P Menushenkov; Moscow State Engineering Physics Institute, 115409 Moscow, Russia |
| Аффилиация | K V Klementev; Moscow State Engineering Physics Institute, 115409 Moscow, Russia |
| Выпуск | 16 |
