Abstract
AbstractWe consider the Hubbard model for the sc lattice which consists of interacting, parallel lying dimer (trimer) planes. Each plane is a collection of equidistant, interacting, parallel lying dimers (trimers). We apply the exact solution of the dimer (trimer) problem after introducing the intrinsic symmetry breaking leading to the ferromagnetic ordering. We present preliminary, test results concerning the phase diagram of the system. In both approximations (dimer and trimer approach) there is a threshold for the ferromagnetic ordering at the Coulomb repulsion U = Ucr. The trimer approach gives a better saturation for the Curie temperature TC vs. U in comparison to the dimer approach. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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