Extended phonon collapse and the origin of the charge-density wave in 2H-NbSe2.

@article{Weber2011ExtendedPC,
  title={Extended phonon collapse and the origin of the charge-density wave in 2H-NbSe2.},
  author={Fridolin Weber and Stephan Rosenkranz and J-P Castellan and Raymond Osborn and Rebecca Hott and Rolf Heid and K B Bohnen and Takeshi Egami and Ayman H. Said and Dan Reznik},
  journal={Physical review letters},
  year={2011},
  volume={107 10},
  pages={107403}
}
We report inelastic x-ray scattering measurements of the temperature dependence of phonon dispersion in the prototypical charge-density-wave (CDW) compound 2H-NbSe2. Surprisingly, acoustic phonons soften to zero frequency and become overdamped over an extended region around the CDW wave vector. 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… CONTINUE READING
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