Physical Sciences and Mathematics Commons^™

Charge Instabilities And Phase-Separation In 3-Band Extended Hubbard Models: Effect Of O-O Hopping, N. Kothekar, K. F. Quader, David W. Allender

David W Allender

We explore the interplay between various interaction and hopping terms, in particular the effect of O-O hopping, tppo on the charge instabilities and phase separation in the three-band extended Hubbard models. Within a weak-coupling mean-field approach, we find that in two dimensions (2D), tppo moves the phase separation boundary appreciably to higher dopings. This would increase the window of doping over which charge-transfer-mediated superconductivity can occur. Considering a larger phase space, we also obtain a more complete picture of the coexistence lines and spinodal decompositions, and determine the charge-transfer-instability critical point. We also consider the 1D case: tppo is found …