Ferromagnetic Polarons in Manganites

Details Ferromagnetic Polarons in Manganites Ferromagnetic Polarons in Manganites

2000-08-24

arxiv.org/abs/cond-mat/0008367v1

Physics

Condensed Matter

Strongly Correlated Electrons

12 pages, accepted in PRB, to be published in November

Scientific paper

10.1103/PhysRevB.62.15047

Using the Lanczos method in linear chains we study the double exchange model in the low concentration limit, including an antiferromagnetic super-exchange K. In the strong coupling limit we find that the ground state contains ferromagnetic polarons whose length is very sensitive to the value of K/t. We investigate the dispersion relation, the trapping by impurities, and the interaction between these polarons. As the overlap between polarons increases, by decreasing K/t, the effective interaction between them changes from antiferromagnetic to ferromagnetic. The scaling to the thermodynamic limit suggests an attractive interaction in the strong coupling regime (J_h > t) and no binding in the weak limit (J_h \simeq t).

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