Ferromagnetic Polarons, Phase Separation, Stripes and Polaron Lattice: The two- and three-dimensional ferromagnetic Kondo Model

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dc.creatorDaghofer, M.
dc.creatorKoller, W.
dc.creatorEvertz, H. G.
dc.creatorvon der Linden, W.
dc.date2004-10-12
dc.date.accessioned2026-07-07T03:01:24Z
dc.date.available2026-07-07T03:01:24Z
dc.descriptionWe investigate the two- and three-dimensional ferromagnetic Kondo lattice model by unbiased Monte Carlo simulations. A phase diagram for the two-dimensional model is presented, in which the stability of magnetic order and ferromagnetic polarons is examined with respect to the antiferromagnetic superexchange J' and temperature. The Monte Carlo simulations reveal that J' > 0.02 strengthens individual polarons while small J' < 0.02 favors larger clusters and phase separation except for small doping. Lowering the temperature stabilizes ferromagnetic polarons for realistic J' > 0.01, while phase separation is only favored for very small J' < 0.01. Our Monte Carlo simulations show that low temperatures can lead to diagonal or vertical stripes depending on J'. Simulations for three-dimensional systems yield ferromagnetic polarons, which form a `polaron lattice' at higher doping levels 0.2 < x < 0.23, when independent polarons do no longer fit into the system. No tendency to phase separation is observed in three dimensions.
dc.description14 pages, 28 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0410274
dc.identifierhttp://arxiv.org/abs/cond-mat/0410274
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/25045
dc.subjectStrongly Correlated Electrons
dc.titleFerromagnetic Polarons, Phase Separation, Stripes and Polaron Lattice: The two- and three-dimensional ferromagnetic Kondo Model
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