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Properties of extended Hubbard models with anisotropic spin-exchange interaction

Czart W. R., Robaszkiewicz S.

Materials Science Poland

2007

Vol. 25, No. 2

485--489

The phase diagrams and electron orderings of the half-filled extended Hubbard models with anisotropic spin-exchange interactions are studied. The cases of ferromagnetic and antiferromagnetic exchange couplings are considered for repulsive on-site interaction (U ? 0). The analysis of these t-U-J||-J??models is performed for d-dimensional hypercubic lattices including d = 1 and d =??by means of the (broken symmetry) HFA supplemented, for d = ?, by the slave-boson mean-field method. The basic features of the derived phase diagrams are discussed.