Interaction between localized magnetic moments in disordered conductors
Al'tshuler B. L., Aronov A. G.
It is shown that because of diffusion of conduction electrons, the interaction between them causes the indirect exchange between localized moments to decrease in a power-law fashion at distances exceeding the mean free path. In the case of repulsion between electrons, it has the ferromagnetic sign, so that when the density of localized spins increases, a transition from the ferromagnetic state to the spin-glass state occurs.