Theory for the mechanisms of antiferromagnetism and superconductivity in the Bechgaard salts

Abstract

We discuss the existence of the interchain antiferromagnetic exchange mechanism and its role in the long range magnetic ordering in the Bechgaard salts. This coupling strongly affects the correlations in the electron- electron channel and produces interchain pairing fluctuations over a wide range of temperatures in the 1D domain. This helps electrons avoid one another. Under bad 1D and 2D nesting conditions, antiferromagnetism is completely frustrated and superconducting long-range order can be stabilized despite important local repulsive interactions along the chains.