J. Phys. IV France 114 (2004) 3
DOI: 10.1051/jp4:2004114001

Mechanism bridging antiferromagnetism and superconductivity to the Mott insulating state in quasi-one dimensional organic conductors

C. Bourbonnais¹ and R. Duprat<sup>1, 2

1</sup>  Département de Physique, Université de Sherbrooke, Sherbrooke, Québec, Canada, J1K-2R1
    e-mail: cbourbon@physique.usherb.ca
²  Departamento de Física Teórica de la Materia Condensada, Facultad de Ciencias, Universidad Autonoma de Madrid, Madrid, Spain
    e-mail: raphael.duprat@uam.es

Abstract
The pressure dependence of the Mott, spin-density-wave and superconducting instabilities of the metallic state of the Bechgaard and Fabre salts is analyzed using weak coupling scaling theory. We show how the mechanism of quantum interference between pairings in the density-wave and superconducting channels, when combined to the influence of intrachain Umklapp scattering and inter-chain hopping under pressure, can play an essential role in the sequence of instabilities for these quasi-one dimensional metals under pressure. Key words. Organic conductors - Mott insulator - Spin-density wave - Superconductivity

© EDP Sciences 2004