Recently synthesized Kagome compounds AV3Sb5 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 CsV3Sb5 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 AV3Sb5.
@article{arxiv.2201.10088,
title = {Effective minimal model and unconventional spin-singlet pairing in Kagome superconductor CsV3Sb5},
author = {Xiao-Cheng Bai and Wen-Feng Wu and Han-Yu Wang and Ya-Min Quan and Xian-Long Wang and Zhi Zeng and Liang-Jian Zou},
journal= {arXiv preprint arXiv:2201.10088},
year = {2022}
}