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We study numerically the one-dimensional ferromagnetic Kondo lattice. Thismodel is widely used to describe nickel and manganese perovskites. Due to thecompetition between double and super-exchange, we find a region where theformation of magnetic polarons induces a charge-ordered state. This ordering ispresent even in the absence of any inter-site Coulomb repulsion. There is aninsulating gap associated to the charge structure formation. We also study theinsulator-metal transition induced by a magnetic field which removessimultaneously both charge and spin ordering.Comment: 7 pages, 11 figure

Charge and spin inhomogeneous phases in the ferromagnetic Kondo lattice model