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arXiv · 1512.00147

Revisitation of superconductivity in K$_2$Cr$_3$As$_3$ based on the six-band model

Li-Da Zhang·Xianxin Wu·Heng Fan·Fan Yang·Jiangping Hu
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Abstract

We investigate the pairing symmetry of the newly synthesized quasi-one-dimension K$_2$Cr$_3$As$_3$ 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 $f_{y^3-3x^2y}$ 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.

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Li-Da Zhang, Xianxin Wu, Heng Fan, Fan Yang, Jiangping Hu. 2015-12-01. Revisitation of superconductivity in K$_2$Cr$_3$As$_3$ based on the six-band model. https://doi.org/10.1209/0295-5075%2F113%2F37003

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