Upper critical field H_c2 in Bechgaard salts (TMTSF)_2PF_6

TL;DR

This paper investigates the upper critical field in Bechgaard salts, proposing that a chiral f-wave triplet superconductor is the most probable pairing symmetry, based on analysis within standard formalism.

Contribution

It introduces a detailed analysis of the upper critical field in Bechgaard salts, suggesting a chiral f-wave triplet pairing as the most likely superconducting symmetry.

Findings

Chiral f-wave superconductor is the most likely pairing symmetry.

Analysis supports triplet pairing consistent with NMR data.

Superconducting symmetry remains uncertain but favors chiral f-wave.

Abstract

The symmetry of the superconducting order parameter in Bechgaard salts is still unknown, though the triplet pairing is well stablished by NMR data and large upper critical field. Here we examine the upper critical field of a few candidate superconductors within the standard formalism. The present analysis suggests strongly chiral f-wave superconductor somewhat similar to the one in Sr_2RuO_4 is the most likely candidate.