2025/06/11 by Liu, Feihu, Liu, Changxu, Zeng, Maolin +1
#FOS: Physical sciences #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity (cond-mat.supr-con)
paper · doi:10.48550/arxiv.2506.09864
The investigation of electronic order-quantum phase interplay in kagome lattices commonly employs the extended Kagome-Hubbard model, where the critical parameters comprise on-site (U) and intersite (V) Coulomb interactions. In prototypical kagome metals \chAV3Sb5 (A = K, Rb, Cs), the geometrically frustrated quasi-2D architecture induces pressure-dependent complexity in vanadium d-electron correlations, necessitating systematic theoretical scrutiny. Utilizing the d-dp model within constrained random phase approximation (cRPA), we quantified U, V, and Hund's coupling J under hydrostatic pressure (0-9 GPa). While \chKV3Sb5 and \chRbV3Sb5 exhibit pressure-insensitive interaction parameters, \chCsV3Sb5 manifests anomalous discontinuities in U and V near 0.2 GPa, suggesting a first-order electronic phase transition. This work establishes cRPA-derived interaction landscapes as critical predictors for pressure-tunable quantum phenomena in correlated kagome systems, offers a new insight into the understanding of the interplay between the CDW transition and the double superconductivity dome in \chCsV3Sb5 at low pressure.