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Abstract
The two-dimensional ferromagnetic Kondo model with classical core spins is studied via unbiased Monte Carlo simulations for a hole doping up to x = 12.5%. A canonical algorithm for finite temperatures is developed. We show that, with realistic parameters for the manganites and at low temperatures, the double-exchange mechanism does not lead to phase separation on a two-dimensional lattice but rather stabilizes individual ferromagnetic polarons for this doping range. A detailed analysis of unbiased Monte Carlo results reveals that the polarons can be treated as independent particles for these hole concentrations. It is found that a simple polaron model describes the physics of the ferromagnetic Kondo model amazingly well. The ferromagnetic polaron picture provides an obvious explanation for the pseudogap in the one-particle spectral function Ak(ω) observed in the ferromagnetic Kondo model.
Originalsprache | englisch |
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Seiten (von - bis) | 5469-5482 |
Fachzeitschrift | Journal of Physics Condensed Matter |
Jahrgang | 16 |
DOIs | |
Publikationsstatus | Veröffentlicht - 2004 |
Projekte
- 1 Laufend
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Stark-korrelierte Vielteilchen-Probleme
Aichhorn, M., Pippan, P., Fulterer, A. M., Neuber, D. R., Knap, M., Evertz, H. G., Michel, F., von der Linden, W., Arrigoni, E. & Daghofer, M.
1/01/98 → …
Projekt: Arbeitsgebiet