Abstract
The properties of the extended Hubbard model with transverse (XY-type) spin-exchange intersite interaction (J ⊥) are studied. The cases of ferromagnetic and antiferromagnetic XY exchange are considered. The analysis of the model is performed for d -dimensional hypercubic lattices 2 ≤ d ≤ ∞, by means of the (broken symmetry) Hartree–Fock approximation supplemented, for d = ∞, by the slave-boson mean-field method. The effects of phase fluctuations on T c of XY phases for d = 2 lattices are estimated within the Kosterlitz–Thouless scenario. Qualitative differences between the properties of the ferromagnetic and antiferromagnetic XY phases are pointed out. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
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