High-order van Hove singularities and nematic instability in the kagome superconductor CsTi3Bi5
Bikash Patra, Amrita Mukherjee, Bahadur Singh
DOI 10.1103/PhysRevB.111.045135 · Physical Review B
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Abstract
ATi3Bi5 (A= Cs or Rb) are emerging topological kagome metals that exhibit superconductivity and nematicity without intertwining translational symmetry-breaking charge orders. In this work, we explore the fermiology of their titanium kagome electrons and identify a set of sublattice-pure, high-order van Hove singularities (VHSs) that can suppress charge ordering and enhance electronic correlations and superconductivity. Our calculations of charge susceptibility for kagome bands with both normal and high-order VHSs emphasize the role of these VHSs in driving electronic nematicity in CsTi3Bi5. Additionally, we compute the phonon spectrum and electron-phonon interactions for CsTi3Bi5 under pristine, doped, and kagome-exposed surface conditions, revealing its robustness against structural instabilities while enhancing the superconducting transition temperature. Our work positions ATi3Bi5 as a key platform for investigating superconductivity and electronic nematicity without translational symmetry-breaking states in kagome metals.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CsTi3Bi5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.8 | Pressure not reported | unknown |
| CsTi3Bi5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.13 | Pressure not reported | unknown |
| RbTi3Bi5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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