Transverse incommensurability in two-coupled chains of quarter-filled spin-density-waves

Spin density wave (SDW) state at, quarter-filling has been examined for two -coupled chains with interchain coupling which is given by a Coulomb repuls ion acting an 4k(F) charge density waves with k(F) being the Fermi wave num ber. In terms of the transfer integral method, we study a transverse incomm ensurability induced by a phase difference delta (a misfit) between two cha ins. The competition between the intrachain commensurability energy and the interchain interaction, which leads to a crossover from the commensurate s tate to the incommensurate state, has been demonstrated by evaluating the r enormalized interchain phase difference, the probability distribution funct ion of the phase and the correlation of density waves.