Abstract
Magnetic solutions for the problem of the Kondo lattice ground state are analysed within the mean-field approximation. For the constant bare density of states, the saturated ferromagnetic Kondo state is stable at not too large intersite interactions J, and with increasing J a first-order transition to the usual ferromagnetic state takes place. The criterion of antiferromagnetism is determined by the nonuniform magnetic susceptibility and reads mod J mod approximately Tk with Tk the Kondo temperature.
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