Polaronic aspects of the two-dimensional ferromagnetic Kondo model

M. Daghofer*, W. Koller, H.G. Evertz, W. Von Der Linden

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


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.
Original languageEnglish
Pages (from-to)5469-5482
JournalJournal of Physics Condensed Matter
Publication statusPublished - 2004

Cite this