Revisitation of superconductivity in K₂Cr₃As₃ based on the six-band model

We investigate the pairing symmetry of the newly synthesized quasi-one-dimension K₂Cr₃As₃ superconductor based on the six-band model. We adopt standard random phase approximation to study the Hubbard-Hund model of the system. Our results confirm the conclusions obtained from our previous three-band model: the triplet p_z- and -wave pairings serve as the leading pairing symmetries in the weak and strong Hund's rule coupling regimes, respectively. For physically realistic parameters, the triplet p_z-wave pairing driven by ferromagnetic fluctuations is the leading pairing symmetry of the system. The consistency between the results of these two models suggests that the obtained p_z-wave pairing symmetry is physical and model independent.