The effect of interchain interaction on the pairing symmetry competition in organic superconductors (TMTSF)$_2$X

TL;DR

This paper explores how interchain repulsive interactions influence pairing symmetry in quasi-one-dimensional organic superconductors, revealing that such interactions favor spin-triplet f-wave pairing over d-wave pairing.

Contribution

It demonstrates through RPA and quantum Monte Carlo methods that interchain repulsion enhances charge fluctuations, promoting spin-triplet f-wave pairing in (TMTSF)$_2$X.

Findings

Interchain repulsive interaction enhances 2k_F charge fluctuations.

Spin-triplet f-wave pairing becomes dominant over d-wave pairing.

Results suggest a realistic scenario for triplet pairing in organic superconductors.

Abstract

We investigate the effect of interchain repulsive interaction on the pairing symmetry competition in quasi-one-dimensional organic superconductors (TMTSF)$_2$X by applying random phase approximation and quantum Monte Carlo calculation to an extended Hubbard model. We find that interchain repulsive interaction enhances the $2k_F$ charge fluctuations, thereby making the possibility of spin-triplet $f$-wave pairing dominating over spin-singlet d-wave pairing realistic.