Flat-Band Enhanced Antiferromagnetic Fluctuations and Unconventional Superconductivity in Pressurized CsCr_3Sb_5
arxiv(2024)
摘要
The interrelationship between flat bands and correlated phenomena such as
unconventional superconductivity stands as an intriguing subject in condensed
matter physics. Here, by first-principles calculations and random phase
approximation analyses, we investigate the electronic structure,
superconducting instability, as well as roles of the incipient flat bands in
kagome superconductor CsCr_3Sb_5. Our calculations reveal strong
antiferromagnetic spin fluctuations in CsCr_3Sb_5, which mediates two sets
of spin-singlet superconducting orders with s_±- and (d_xy,
d_x^2-y^2)-wave symmetries. Under the dominance of local Coulomb
interactions, the unoccupied incipient flat bands are shown to be crucial for
the momentum dependence of spin fluctuations and thus the superconductivity.
Our further analyses unveil a sublattice-momentum-coupling-driven mechanism for
this momentum-dependent enhancement of the fluctuations, which provides us a
new perspective for future studies of geometrically frustrated systems.
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