Magnetic Polarons in the 1D FM Kondo Model

Details Magnetic Polarons in the 1D FM Kondo Model Magnetic Polarons in the 1D FM Kondo Model

2003-01-20

arxiv.org/abs/cond-mat/0301350v2

Phys. Rev. B 67 174418 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

11 pages, 9 figures included, additional refs added

Scientific paper

10.1103/PhysRevB.67.174418

The ferromagnetic Kondo model with classical corespins is studied via unbiased Monte-Carlo simulations. We show that with realistic parameters for the manganites and at low temperatures, the double-exchange mechanism does not lead to phase separation in one-dimensional chains but rather stabilizes individual ferromagnetic polarons. Within the ferromagnetic polaron picture, the pseudogap in the one-particle spectral function A_k(\omega) can easily be explained. Ferromagnetic polarons also clear up a seeming failure of the double-exchange mechanism in explaining the comparable bandwidths in the ferromagnetic and paramagnetic phase. For our analysis, we extend a simplified model, the finite temperature uniform hopping approach (UHA), to include polarons. It can easily be evaluated numerically and provides a simple quantitative understanding of the physical features of the ferromagnetic Kondo model.

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