Physics – Condensed Matter
Scientific paper
1996-01-22
Physics
Condensed Matter
16 pages and 10 figures in postscript format, compressed with uufiles
Scientific paper
10.1103/PhysRevB.53.15327
We study the Cu-O valence instability (VI) and the related phase separation (PS) driven by Cu-O nearest-neighbor repulsion $U_{pd}$, using an effective extended one-band Hubbard model ($H_{eff}$) obtained from the extended three-bandHubbard model, through an appropriate low-energy reduction. $H_{eff}$ is solved by exact diagonalization of a square cluster with 10 unit cells and also within a slave-boson mean-field theory. Its parameters depend on doping for $U_{pd}\neq 0$ or on-site O repulsion $U_p\neq 0$. The results using both techniques coincide in that there is neither VI nor PS for doping levels $x<0.5$ if $U_{pd}\lesssim 2$ eV. The PS region begins for $U_{pd}\gtrsim 2$ eV at large doping $x>0.6$ and increases with increasing $U_{pd}$. The PS also increases with increasing on-site Cu repulsion $U_d$.
Aligia Armando A.
Simon M. E.
No associations
LandOfFree
Phase separation and valence instabilities in cuprate superconductors. Effective one-band model approach does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Phase separation and valence instabilities in cuprate superconductors. Effective one-band model approach, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Phase separation and valence instabilities in cuprate superconductors. Effective one-band model approach will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-348775