Magnetic transition and polaron crossover in a two-site single polaron model including double exchange interaction

Details Magnetic transition and polaron crossover in a two-site single polaron model including double exchange interaction Magnetic transition and polaron crossover in a two-site single polaron model including double exchange interaction

2000-08-10

arxiv.org/abs/cond-mat/0008159v2

Physics

Condensed Matter

REVTEX and ps files, accepted in the European Physical Jour. B

Scientific paper

10.1007/s100510070004

A two-site double exchange model with a single polaron is studied using a perturbation expansion based on the modified Lang-Firsov transformation. The antiferromagnetic to ferromagnetic transition and the crossover from small to large polaron are investigated for different values of the antiferromagnetic interaction ($J$) between the core spins and the hopping ($t$) of the itinerant electron. Effect of the external magnetic field on the small to large polaron crossover and on the polaronic kinetic energy are studied. When the magnetic transition and the small to large polaron crossover coincide for some suitable range of $J/t$, the magnetic field has very pronounced effect on the transport.

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