Krykunov M. The electronic structure of low-dimensional conjugated polymeric compounds and stacked organometallic ferromagnets with the charge transfer

Investigation objects: the crystals of organic and organometallic compounds. Purpose: to obtain the criteria of the ferromagnetic ordering stability in the crystals of conjugated polymeric compounds and stacked organometallic ferromagnets with the charge transfer. Methods: operator perturbation theory, cyclic spin permutations technique, projection operators technique, exact diagonalizaion, DMRG method. It has been estimated, than in the Kondo lattice model for organometallic ferromagnets the increasing of the ferromagnetic coupling between p- and d-electrons leads to the magnetic transition with the jump of the ground state spin. The intervals of model parameters for which the ground state spin has a maximal value for the Hubbard model on the various anisotropic lattices have been estimated. Degree of application: using of the obtained criteria of the ferromagnetic ordering stability in the crystals of molecular ferromagnets in solid state chemistry