ELECTRONS WITH ALTERNATING ON-SITE AND CORRELATED HOPPING INTERACTIONS

The 1D one-band Hubbard model with different repulsive on-site interac tions on even (U + V > 0) and odd (U - V > 0) sites, supplemented by t he correlated-hopping term (t > 0), describing the modification of t he electron hopping by the presence of other particles on the sites, i s considered as a 1D model for CuO systems. The ground state phase dia gram is studied within the framework of the bosonization technique and renormalization group analysis valid for weak coupling. Depending on the choice of model parameters, the following sequences of phase trans itions with increasing band-filling occur: 1) metal-insulator-metal (f or t less-than-or-equal-to U/4); 2) metal-insulator-metal-supercondu ctor (for U/4 < t less-than-or-equal-to U/square-root 8); 3) upercon ductor-metal-insulator-metal-superconductor (for U/square-root 8 less- than-or-equal-to t < (U + V)/square-root 8) and 4) metal-superconduc tor (for (U + V)/square-root 8 less-than-or-equal-to t ).