Abstract
The commensurate-incommensurate transition, which occurs perpendicular to chains in quasi-one-dimensional quarter-filled spin density wave (SDW) state, has been examined within the classical treatment. By applying the renormalization group method,we derive phase diagram of commensurate and incommensurate states on the plane of temperature and the transverse misfit corresponding to the difference of phases between chains. The response functions for 2 k F SDW and 4 k F CDW ( k F being the Fermi wave vector) are calculated to examine the role of the misfit and the sign of commensurability energy. The relevance to the SDW state in (TMTSF) 2 X salts is discussed.
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