Effective six-band model and unconventional spin-singlet pairing in Kagome superconductor CsV3Sb5. (1st December 2022)

• Record Type: Journal Article
• Authors: Bai, Xiao-Cheng; Wu, Wen-Feng; Wang, Han-Yu; Quan, Ya-Min; Wang, Xianlong; Zeng, Zhi; Zou, Liang-Jian
• Is Part Of: New journal of physics. Volume 24:Number 12(2022)
• Publication Date: 2022-12-01
• Subjects: Kagome superconductor -- pairing mechanism -- spin fluctuations -- I-wave pairing; Physics -- Periodicals; Physics; Periodicals; 530.05
• DOI: 10.1088/1367-2630/aca81d
• Languages: English
• ISSNs: 1367-2630

Abstract

Abstract: Recently synthesized Kagome compounds AV3 Sb5 attract great attention due to the unusual coexistence of the topology, charge density wave, and superconductivity. In this work, based on the band structures for CsV3 Sb5 in the pristine phase, we construct an effective six-band model for the low-energy processes; utilizing the random phase approximation on the effective six-band model, we show that the E 1 u ( p wave) pairing dominates in the region of 0 < U < 0.32 eV, the A 2 g ( I wave) in the region of 0.32 < U < 0.75 eV and the E 2 g ( d wave) in the region of 0.75 < U < 1 eV. Considering that the correlation in AV3 Sb5 is weak or intermediate, these results suggest that pairing symmetry is A 2 g ( I -wave) in the CsV3 Sb5, which can explain some recent experiments about pairing symmetry.