Flat-band enhanced antiferromagnetic fluctuations and superconductivity in pressurized CsCr₃Sb₅.

ABSTRACT: The spin dynamics and electronic orders of the kagome system at different filling levels stand as an intriguing subject in condensed matter physics. By first-principles calculations and random phase approximation analyses, we investigate the spin fluctuations and superconducting instabilities in kagome phase of CsCr₃Sb₅ under high pressure. At the filling level slightly below the kagome flat bands, our calculations reveal strong antiferromagnetic spin fluctuations in CsCr₃Sb₅, together with a leading s_±-wave and a competing (d_xy, dx2-y2 )-wave superconducting order. Unlike the general intuition that the flat bands are closely related to the ferromagnetic correlations, here we propose a sublattice-momentum-coupling-driven mec

SUBMITTER: Wu S 

PROVIDER: S-EPMC11799183 | biostudies-literature | 2025 Feb

REPOSITORIES: biostudies-literature