Electron Orderings of Half-Filled Extended Hubbard Models with Spin- and Charge-Exchange Interaction
W.R. Czart and S. Robaszkiewicz
Institute of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland
Full Text PDF
Received: 25 09 2005;
The electron orderings of the half-filled extended Hubbard models (i) with anisotropic spin-exchange interactions (the t-U-Jǁ-J model) and (ii) with charge-exchange interaction (the t-U-I model) are discussed. In particular, we present new results concerning the phase diagrams of the model (i) in the case of uniaxial spin exchange (Jǁ≠0) for d-dimensional hypercubic lattices (1≤d≤∞) and conclude about the basic effects of the particular spin- and charge-exchange interaction terms (Jǁ, J, and I) in both models.
DOI: 10.12693/APhysPolA.109.577
PACS numbers: 71.10.Fd, 75.10.-b, 75.30.Gw, 71.45.Lr, 74.20.-z