Electron-phonon interaction in the three-band model
| dc.creator | Rösch, O. | |
| dc.creator | Gunnarsson, O. | |
| dc.date | 2004-07-20 | |
| dc.date.accessioned | 2026-07-07T06:22:51Z | |
| dc.date.available | 2026-07-07T06:22:51Z | |
| dc.description | We study the half-breathing phonon in the three-band model of a high temperature superconductor, allowing for vibrations of atoms and resulting changes of hopping parameters. Two different approaches are compared. From the three-band model a t-J model with phonons can be derived, and phonon properties can be calculated. To make contact to density functional calculations, we also study the three-band model in the Hartree-Fock (HF) approximation. The paramagnetic HF solution, appropriate for the doped cuprates, has similarities to the local-density approximation (LDA). However, in contrast to the LDA, the existence of an antiferromagnetic insulating solution for the undoped system makes it possible to study the softening of the half-breathing phonon under doping. We find that although the HF approximation and the t-J model give similar softenings, these softenings happen in quite different ways. We also find that the HF approximation gives an incorrect doping and q dependence for the softening and too small a width for the (half-)breathing phonon. | |
| dc.description | 7 pages, RevTeX, 4 eps figures | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0407507 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0407507 | |
| dc.identifier | Phys. Rev. B 70, 224518 (2004) | |
| dc.identifier | doi:10.1103/PhysRevB.70.224518 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/96040 | |
| dc.subject | Strongly Correlated Electrons | |
| dc.subject | Materials Science | |
| dc.title | Electron-phonon interaction in the three-band model | |
| dc.type | text |