Spin density wave field investigation in quasi-one-dimensional conductors*

Spin Density Wave (SDW) as a type of long range spin ordering exhibits in low dimensional conductors. It has been found to accompany or coexist or even compete with macroscopic coherence like superconductivity. However, its significance is not fully understood. It has been a long mystery regarding the mechanism of the resistivity upturn at ~ 25 K and its association with the superconductivity at lower temperatures exhibiting in the quasi-one-dimensional conductor Li_0.9Mo₆O_17. Here we report a spin density wave field investigation using a simple theoretical model, which helps a much better understanding of the experimental data previously reported and some of the ⁷Li-NMR data we have as well. Our result suggests that SDW be the mechanism of the resistivity upturn appearing at ~ 25 K and it also be the possible electron quantum ground state of the material.