Triplet pz-wave pairing in quasi-one-dimensional A2Cr3As3 superconductors (A=K,Rb,Cs)

Xianxin Wu; Fan Yang; Congcong Le; Heng Fan; Jiangping Hu

doi:10.1103/PhysRevB.92.104511

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Triplet pz-wave pairing in quasi-one-dimensional A2Cr3As3 superconductors (A=K,Rb,Cs)

Xianxin Wu, Fan Yang, Congcong Le, Heng Fan, Jiangping Hu

DOI 10.1103/PhysRevB.92.104511 · Physical Review B

T1

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Abstract

We construct minimum effective models to investigate the pairing symmetry in the newly discovered quasi-one-dimensional superconductor K2Cr3As3. We show that a minimum three-band model based on the dz2, dxy, and dx2−y2 orbitals of one Cr sublattice can capture the band structures near Fermi surfaces. In both weak and strong coupling limits, the standard random phase approximation and mean-field solutions consistently yield the triplet pz-wave pairing as the leading pairing symmetry for physically realistic parameters. The triplet pairing is driven by the ferromagnetic fluctuations within the sublattice. The gap function of the pairing state possesses line gap nodes on the kz=0 plane on the Fermi surfaces.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
K2Cr3As3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	6.1	Pressure unresolved	unknown
Rb2Cr3As3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Cs2Cr3As3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown