Triplet superconducting pairing and density-wave instabilities in organic conductors

TL;DR

This study uses a renormalization group approach to map the phase diagram of quasi-one-dimensional organic conductors, revealing coexistence of density waves and triplet superconductivity, aligning with experimental observations.

Contribution

It provides a comprehensive phase diagram including density-wave and triplet superconducting phases, highlighting the role of interchain interactions and nesting deviations.

Findings

Proximity of spin- and charge-density-wave phases

Existence of singlet d-wave and triplet f-wave superconducting phases

Alignment with experimental findings in Bechgaard salts

Abstract

Using a renormalization group approach, we determine the phase diagram of an extended quasi-one-dimensional electron gas model that includes interchain hopping, nesting deviations and both intrachain and interchain repulsive interactions. We find a close proximity of spin-density- and charge-density-wave phases, singlet d-wave and triplet f-wave superconducting phases. There is a striking correspondence between our results and recent puzzling experimental findings in the Bechgaard salts, including the coexistence of spin-density-wave and charge-density-wave phases and the possibility of a triplet pairing in the superconducting phase.