ELECTRONIC CALCULATIONS ON THE MGTIOBO3 WARWICKITE - A REAL-SPACE RENORMALIZATION APPROACH

Electronic properties of a warwickite, MgTiOBO3, are calculated within the Green's functions formalism, taking into account the crystallogra phic structure of the system and using a multiorbital basis to represe nt the Hamiltonian. The many body problem is considered through an all oy analog approximation for the intraatomic interaction at the titaniu m sites by using real-space renormalization techniques. Local and tota l density of states reflect the one-dimensional character of the struc ture and its insulating nature. The metal-nonmetal transition is also analyzed as a function of the charge doping.