Abstract
The electric field dependence of the dielectric properties and the nonlinear conductance of below 50 K has been investigated. A large dielectric constant of about is obtained up to Hz, which cannot be attributed to hopping of the localized carriers alone, the collective excitations of the commensurate charge-density-wave must be another contributor. The dielectric spectra disperse slightly in our measured temperature and frequency range. At a moderate dc bias field, the real part of the dielectric constant decreases. We propose that the separation of bound soliton-antisoliton pairs may be a contributor to the reduction of and the accompanying nonlinear conductivity with increasing dc bias.
- Received 27 June 2017
- Revised 18 April 2018
DOI:https://doi.org/10.1103/PhysRevB.97.195117
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