Effective minimal model and unconventional spin-singlet pairing in Kagome superconductor CsV3Sb5

Abstract

Recently synthesized Kagome compounds AV${}_3$Sb${}_5$ attract great attention due to the unusual coexistence of the topology, charge density wave and superconductivity. In this {\it Letter}, based on the band structures for CsV${}_3$Sb${}_5$ in pristine phase, we fit an effective 6-band model for the low-energy processes; utilizing the random phase approximation (RPA) on the effective minimal model, we obtain the momentum-resolved static spin susceptibility attributing the spin-fluctuation pairing mechanism, we find that the superconducting pairing strengths increase with the lift of the Coulomb correlation, and the superconductive pairing symmetry is singlet, the gap functions are antisymmetric with respect to the x-axis and the y-axis in the intermediate to strong Coulomb correlated regime,indicating the unconventional superconductivity in Kagome compounds AV${}_3$Sb${}_5$.

6 pages, 6 figures

References in corpus (13)

• CsV${}_3$Sb${}_5$: a ${\mathbb{Z}}_2$ topological kagome metal with a superconducting ground state
• Near-degeneracy of several pairing channels in multiorbital models for the Fe-pnictides
• Superconductivity in the ${\mathbb{Z}}_2$ kagome metal KV${}_3$Sb${}_5$
• Superconductivity and normal-state properties of kagome metal RbV3Sb5 single crystals
• Unusual competition of superconductivity and charge-density-wave state in a compressed topological kagome metal
• Highly-robust reentrant superconductivity in CsV3Sb5 under pressure
• Absence of local moments in the kagome metal KV3Sb5 as determined by muon spin spectroscopy
• Anisotropic superconducting properties of Kagome metal CsV3Sb5
• Pairing symmetry in a two-orbital Hubbard model on a square lattice
• Electron-phonon coupling in the charge density wave state of CsV${}_3$Sb${}_5$
• High-Tc superconductivity up to 55 K under high pressure in the heavily electron doped Lix(NH3)yFe2Se2 single crystal
• Superconducting pairing symmetry in the kagome-lattice Hubbard model
• Magnetic properties of pressurized CsV${}_3$Sb${}_5$ calculated by using a hybrid functional

Cited by in corpus (4)

• Commensurate-to-incommensurate transition of charge-density-wave order and a possible quantum critical point in pressurized kagome metal CsV${}_3$Sb${}_5$
• Unconventional superconductivity protected from disorder on the kagome lattice
• Superconductivity from Orbital-Selective Electron-Phonon Coupling in $A{\mathrm{V}}_3{\mathrm{Sb}}_5$
• Existence of Hebel-Slichter peak in unconventional kagome superconductors