QUASI-ONE-DIMENSIONAL SUPERCONDUCTORS IN STRONG MAGNETIC-FIELD

We determine the phase diagram of a quasi-one-dimensional conductor (w eakly coupled chains system with an open Fermi surface) in a magnetic field. The superconducting state evolves from an Abrikosov vortex latt ice in weak field to a Josephson vortex lattice in very strong field, with a reentrance of the superconducting phase. Between these two limi ts, there is a cascade of first order transitions between different su perconducting phases due to commensurability effects between the cryst alline lattice and the order parameter. In these phases, the order par ameter has a laminar structure.