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

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

2011-03-29

arxiv.org/abs/1103.5755v1

Phys. Rev. Lett. 107, 107403 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevLett.107.107403

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.

Affiliated with

Also associated with

No associations

Rating

Extended Phonon Collapse and the Origin of the Charge-Density-Wave in NbSe$_2$ does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Extended Phonon Collapse and the Origin of the Charge-Density-Wave in NbSe$_2$, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Extended Phonon Collapse and the Origin of the Charge-Density-Wave in NbSe$_2$ will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-566457