Publication Title

Physical Review B

Publication Date

3-1-1995

Document Type

Article

DOI

10.1103/PhysRevB.51.5899

Keywords

Infinity Limit, Superconductivity

Disciplines

Physics

Abstract

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 to play a similar role, but the phase separation occurs at significantly lower dopings compared to 2D. This may be of interest to recent Monte Carlo calculations.

Comments

Copyright 1995 American Physical Society. Available on publisher's site at http://dx.doi.org/10.1103/PhysRevB.51.5899.


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