Interplay between Spin and Phonon Fluctuations in the double-exchange model for the manganites
| dc.creator | Capone, M. | |
| dc.creator | Ciuchi, S. | |
| dc.date | 2001-07-03 | |
| dc.date.accessioned | 2026-07-07T08:22:22Z | |
| dc.date.available | 2026-07-07T08:22:22Z | |
| dc.description | We present exact solutions, mainly analytical, for the two-site double-exchange-Holstein model, that allow us to draw a complete picture of the role of both phonon and spin quantum fluctuations in determining the short-range correlations in the manganites. We provide analytical solutions of the model for arbitrary electron-phonon coupling and phonon frequency, for $S=1/2$ and for the classical spin limit $S=\infty$, and compare these results with numerical diagonalization of the realistic $S=3/2$ case. The comparison reveals that the realistic case $S=3/2$ is not well described by the classical spin limit, which is often used in literature. On the other hand, the phonon fluctuations, parametrized by the phonon frequency $ω_0$, stabilize ferromagnetic phases with respect to the adiabatic limit. We also provide a complete analysis on the polaron crossover in this model. | |
| dc.description | 12 pages, 8 figures | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0107062 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0107062 | |
| dc.identifier | Phys. Rev. B 65, 104409 (2002) | |
| dc.identifier | doi:10.1103/PhysRevB.65.104409 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/135635 | |
| dc.subject | Strongly Correlated Electrons | |
| dc.title | Interplay between Spin and Phonon Fluctuations in the double-exchange model for the manganites | |
| dc.type | text |