Magnetic impurities on (AB/sub 2/)/sub x/, polymeric chains

Summary form only given. The techniques of renormalization of interactions and transfer matrices are used to investigate spin polarization effects on (AB/sub 2/)/sub x/ chains, within a Hartree-Fock solution to a Hubbard diagonal hamiltonian approximation. The electronic structure of infinite chains is obtained for different fractional band occupancies and ffie magnetization of the system is examined for different values of the one-center repulsion integrals U. It is observed that one third of the total electronic states available are associated to non dispersive states localized on the B sites; as a consequence, sharp metal-insulator transitions can be predicted on half-filled systems, for critical values of U/sub A/ and U/sub B/. The damped spin density wave resulting from a substitutional impurity on an A center is calculated for different regions of the parameter space of the problem.