Skip to main content
Article
Charge Instabilities and Phase-Separation in 3-Band Extended Hubbard Models: Effect of O-O Hopping
Physical Review B
  • N. Kothekar, Kent State University - Kent Campus
  • K. F Quader, Kent State University - Kent Campus
  • David W Allender, Kent State University - Kent Campus
Publication Date
3-1-1995
Document Type
Article
DOI
10.1103/PhysRevB.51.5899
Keywords
  • Infinity Limit,
  • Superconductivity
Disciplines
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.

Citation Information
N. Kothekar, K. F Quader and David W Allender. "Charge Instabilities and Phase-Separation in 3-Band Extended Hubbard Models: Effect of O-O Hopping" Physical Review B Vol. 51 Iss. 9 (1995) p. 5889 - 5907
Available at: http://works.bepress.com/david_allender/8/