Spin density wave transition in (TMTSF)(2)PF6 under uniaxial strain

The effect of uniaxial strain to spin-density-wave (SDW) transition in the organic conductor (TMTSF)(2)PF6 was studied. Strain was applied along the a -. b'- and c'-axes separately. It was found that the SDW transition was mos t strongly suppressed by the strain along the one-dimensional (1-D) a-axis, and most weakly along the c*-axis, whereas our first expectation was that the most effective strain to the SDW suppression was along the b'-axis, sin ce the interaction along b or b' is directly associated with the denesting of the quasi-one-dimensional Fermi surface. We discuss why the strain along the axes other than the b'-axis suppress the 1-D nature and therefore SDW.