Abstract
Spin density wave (SDW) state of a quasi-one-dimensional organic conductors near the quarter-filling has been examined in the presence of dimerization, which leads to properties of half-filling. By applying a transfer integral method to a single chain with molecular fields determined self-consistently, it has been shown that two kinds of commensurate states appear for a small misfit parameter due to a competition between the commensurability energy and the dimerization energy. Several phase diagrams of the commensurate state and the incommensurate state have been obtained as the function of misfit parameter, temperature and dimerization.
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