Phase diagram of quasi-one-dimensional conductors in strong magnetic field

The phase diagram of quasi-1D conductors in magnetic field is derived. We perform a microscopic calculation of the Ginzburg-Landau free energy coefficients. They exhibit a novel behaviour as a function of field. As a result, different regimes of SDW ordering appear with increasing field, corresponding to different types of quantized nesting. This description may account for nearly all the available experimental data in (TMTSF) 2 ClO 4 Calcul microscopique des coefficients de Ginzburg-Landau pour l'energie libre, qui presentent un comportement original en fonction du champ magnetique: en champ croissant, apparition de differents regimes d'ordre d'onde de densite de spin correspondant a differents types de «nesting» quantifie. Explication de presque toutes les donnees experimentales sur (TMTSF) 2 ClO 4