Shift in the longitudinal sound velocity due to sliding charge density waves

  • S. N. Coppersmith
  • C. M. Varma
III. Dynamics of Charge Density Waves, Theory
Part of the Lecture Notes in Physics book series (LNP, volume 217)


The nonlinear conductivity observed for moderate electric fields in NbSe3, TaS3, (TaS4)2I, and K0.3Mo03 below the charge density wave (CDW) transition is believed to be due to the sliding of the CDWs. The sliding motion leads to a Doppler shift of the x-ray diffraction peaks, but this effect has not yet been resolved. We show here that besides the Doppler shift, a sliding incommensurate CDW causes a change in the longitudinal sound velocity of the crystal that is linear in the CDW velocity. The resulting anisotropic shift is estimated in a mean field approximation and found to be experimentally observable.


Sound Velocity Doppler Shift Field Approximation Charge Density Wave Excess Conductivity 
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Copyright information

© Springer-Verlag 1985

Authors and Affiliations

  • S. N. Coppersmith
    • 1
  • C. M. Varma
    • 2
  1. 1.Brookhaven National LaboratoryUptonUSA
  2. 2.AT&T Bell LaboratoriesMurray HillUSA

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