(1) Centre de Recherche sur les Propriétés électroniques de Matériaux Avancés, Département de Physique, Université de Sherbrooke, Sherbrooke, Québec, J1K 2R1, Canada, CA
Abstract:
The interference between spin-density-wave and superconducting instabilities in quasi-one-dimensional correlated metals is
analyzed using the renormalization group method. At the one-loop level, we show how the interference leads to a continuous
crossover from a spin-density-wave state to unconventional superconductivity when deviations from perfect nesting of the Fermi
surface exceed a critical value. Singlet pairing between electrons on neighboring stacks is found to be the most favorable
symmetry for superconductivity. The consequences of non uniform spin-density-wave pairing on the structure of phase diagram
within the crossover region is also discussed.
Received 3 January 2001 and Received in final form 1st March 2001