Extended Phonon Collapse and the Origin of the Charge-Density-Wave in NbSe${}_2$

Abstract

We report inelastic x-ray scattering measurements of the temperature dependence of phonon dispersion in the prototypical charge-density-wave (CDW) compound NbSe2. Surprisingly, acoustic phonons soften to zero frequency and become overdamped over an extended region around the CDW wavevector. This extended phonon collapse is dramatically different from the sharp cusp in the phonon dispersion expected from Fermi surface nesting. Instead, our experiments combined with ab initio calculations, show that it is the wavevector dependence of the electron-phonon coupling that drives the CDW formation in NbSe${}_2$ and determines its periodicity. This mechanism explains the so far enigmatic behavior of CDW in NbSe${}_2$ and may provide a new approach to other strongly correlated systems where electron-phonon coupling is important.

References in corpus (5)

• Two energy gaps and Fermi surface 'arcs' in NbSe2
• Sliding charge density wave in manganites
• Fermi surface nesting in several transition metal dichalcogenides
• Giant Kohn anomaly and the phase transition in charge density wave ZrTe_3
• Primary role of the barely occupied states in the charge density wave formation of NbSe2

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