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Starting from a three-dimensional generalization of the Lee-Rice-Anderson Hamiltonian (wherein the electron motion is still treated one dimensionally), the damping of a field-driven q=0 phason is studied. The dominant contribution to the phason damping comes from its scattering by a thermal phason to produce two q0 phasons. Taking into account the nonlinearity of the phason spectrum, we find that the associated charge-density-wave (CDW) conductivity in the (10--100) -GHz region is comparable to that in the metallic phase, in rough agreement with experiment. The contribution to damping of phason scattering by thermal amplitude modes is a factor of (1/5) smaller than that of thermal phasons. Comparison of the order of magnitude of the damping coefficient with experiment is discussed, and possible theoretical improvements are proposed.
Takada et al. (Tue,) studied this question.