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Title: Is the kagome charge-density wave electronic or phonon driven
Plain: The charge order could arise from electrons near special points of the band structure interacting with each other, or from coupling to lattice vibrations that soften.
Precise: Determine whether the charge-density wave of AV3Sb5 is driven by electronic instabilities of the van Hove singularities at M (nesting and interactions) or by momentum-dependent electron-phonon coupling with a soft breathing phonon. An answer is inelastic x-ray measurements of phonon softening plus momentum-resolved electron-phonon coupling compared with the electronic susceptibility.
Settled by: Inelastic x-ray scattering of the phonon dispersion versus temperature combined with first-principles electron-phonon and electronic susceptibility calculations.
Kind: phenomenon
Answer type: mechanism
References: (empty)
Literature status: contested
Status note: (empty)
Posed since: 2021