Wave vector dependent electron-phonon coupling drives charge-density-wave formation in TbTe3

Abstract

We present a high energy-resolution inelastic x-ray scattering investigation of the soft phonon mode in the charge-density-wave system TbTe${}_3$. We analyze our data based on lattice dynamical calculations using density-functional-perturbation-theory and find clear evidence that strongly momentum dependent electron-phonon-coupling defines the periodicity of the CDW superstructure: Our experiment reveals strong phonon softening and increased phonon line widths over a large part in reciprocal space adjacent to the CDW ordering vector $q_{CDW}=(0,0,0.3)$. Further, $q_{CDW}$ is clearly offset from the wave vector of (weak) Fermi surface nesting $q_{FS}=(0,0,0.25)$ and our detailed analysis indicates that electron-phonon-coupling is responsible for this shift. Hence, we can add TbTe${}_3$, which was previously considered as a canonical CDW compound following the Peierls scenario, to the list of distinct charge-density-wave materials characterized by momentum dependent electron-phonon coupling.

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• Role of equilibrium fluctuations in light-induced order
• Amplitude dynamics of charge density wave in LaTe${}_3$: theoretical description of pump-probe experiments
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• Effect of dimensionality on sliding charge density waves. The case of the quasi-two dimensional TbTe${}_3$ system probed by coherent x-ray diffraction
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• Atomic-Scale Visualization of a Cascade of Magnetic Orders in the Layered Antiferromagnet $GdT{e}_3$
• Emergent Tetragonality in a Fundamentally Orthorhombic Material
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• Coherent Modulation of Quasiparticle Scattering Rates in a Photoexcited Charge-Density-Wave System
• Interplay of Charge Density Wave States and Strain at the Surface of CeTe${}_2$
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• Electron-momentum dependence of electron-phonon coupling underlies dramatic phonon renormalization in YNi${}_2$B${}_2$C
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• Theory of charge density wave depinning by electromechanical effect
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• Evolution of charge-density-wave soft phonon modes in ${\mathrm{Pd}}_x{\mathrm{ErTe}}_3$
• Clustering-Enhanced Time- and Angle-Resolved Photoemission Study of LaTe${}_3$: Absence of a Photoinduced Secondary CDW in the Electronic Structure