NON-FERMI LIQUIDS IN THE EXTENDED HUBBARD-MODEL

I summarize recent work on non-Fermi liquids within a certain generali zed Anderson impurity model as well as in the large-dimensionality (D) limit of the two-band extended Hubbard model. The competition between local charge and spin fluctuations leads either to a Fermi liquid wit h renormalized quasiparticle excitations, or to non-Fermi liquids with spin-charge separation. These results provide new insights into the p henomenological similarities and differences between different correla ted metals. While presenting these results, I outline a general strate gy of local approach to non-Fermi liquids in correlated electron syste ms.