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 |

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Received: 25 09 2005; |

The electron orderings of the half-filled extended Hubbard models (i) with anisotropic spin-exchange interactions (the t-U-J_{ǁ}-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 (J_{ǁ}≠0) for d-dimensional hypercubic lattices (1≤d≤∞) and conclude about the basic effects of the particular spin- and charge-exchange interaction terms (J_{ǁ}, 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 |