Abstract
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 pz- 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 pz-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 pz-wave pairing symmetry is physical and model independent.
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