ITINERANT FERROMAGNETISM IN DISORDERED METALS - A MEAN-FIELD THEORY

We develop a mean-field approach to interacting disordered systems of itinerant electrons based on a statistical treatment of disorder enhan ced Hartree-Fock interactions. We demonstrate that for d less than or equal to 2 a disordered system may exhibit a finite temperature partia l spin polarization even if its clean analog is paramagnetic. The diso rder and temperature dependent magnetization and spin susceptibility a re calculated. Possible relevance to recent experiments on quantum dot s is discussed. [S0031-9007(98)07325-6].