Abstract
The interplay of alternating potential and dimerization ( u ) has been examined for the spin density wave (SDW) state in a quasi-one-dimensional system at quarter-filling, which is expressed in terms of θ, a phase of the SDW. By taking account of the dimerization energy u 2 /(2 g ) with an effective coupling constant g , we evaluate critical temperatures, T c , T s and T u , corresponding to the onset of Δ c (∝ ), Δ s (∝ ) and u , respectively. Two kinds of noticeable critical temperatures of the SDW states are obtained where T c > T s = T u for g T c = T s for g > g c . The quantity g c is increased by both the alternating potential and the interchain coupling. The relevance to the SDW state in (EDT-TTF) 2 AuBr 2 salt is discussed.
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