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

The temperature–uniaxial pressure (T–P) phase diagram of metal, spin density wave (SDW) in (TMTSF)2PF6 was found to be apparently quite similar to that of hydrostatic pressure irrespective of the direction of the uniaxial pressure in the strain method. But it should be noted that although the compressing in different direction made almost no difference in the phase diagram, it enormously changed the anisotropy in ρ, based on the measurement of ρa, ρb′ and rc∗. The strain along b′ and c∗-axes reduces remarkably the anisotropy, ta/tb′=4.3 with p//c∗=10 kbar, for instance, where still SDW is present. With this result, the nesting model of SDW in terms of the anisotropy between ta, tb′ and tb′′ has to be reconsidered. We extended our study to rapid oscillation (RO), which is present only below 5 kbar with strain along c∗, but not with strains along a and b′. With this result of RO, we revisit the SDW and electronic structure under uniaxial strain.