Abstract
With an extended Su–Schrieffer–Heeger Hamiltonian including Hubbard energy and intersite Coulomb repulsion, we study the effects of two kinds of boundary conditions on the spin configuration and lattice distortion in organic ferromagnetic polymers with interchain coupling. It is shown that if the length L of the lattice is even, there is dimerization along the main chain and uniform spin density along side radicals. If L is odd, there exist domain wall solitons describing the displacement of the lattice along the main chain, and spin soliton with envelope shape describing the localization of spin at side radicals. Under the condition of strong interchain coupling, a great fluctuation of spin and distortion appear along the main chain and side radicals, and the system transfers to two-dimensional one. The e–e correlation reduces the amplitude of spin soliton and domain wall while electron–phonon coupling has the reverse effect.
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