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Abstract
The twodimensional 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 doubleexchange mechanism does not lead to phase separation on a twodimensional 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 oneparticle spectral function Ak(ω) observed in the ferromagnetic Kondo model.
Original language  English 

Pages (fromto)  54695482 
Journal  Journal of Physics Condensed Matter 
Volume  16 
DOIs  
Publication status  Published  2004 
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 1 Active

StronglyCorrelatedManyBodyProblems
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 → …
Project: Research area