Field-induced dielectric response saturation ino-TaS₃

Abstract

We investigated dependence of the dielectric properties on temperature and electric field below 50 K along the chain direction of o-TaS3. With external electric field increase, two threshold features could be identified. For electric fields somewhat larger than the lower threshold [Formula: see text], the dielectric constant starts to decrease whereas the conductivity increases due to the tunnelling of solitons. For higher external electric field we observe a saturation of dielectric response and analyze that the possible reasons may be related to the polarization behavior of charged solitons. With a decrease in temperature, the effect of external field on the dielectric response of the system weakens gradually and at 13 K it diminishes due to soliton freezing.

Possible origin of nonlinear conductivity and large dielectric constant in the commensurate charge-density-wave phase of 1T−TaS2

“…Temperature and field dependent complex dielectric or conductivity spectrum is a powerful probe for investigating the charge transport and polarization behavior of various systems [9,10,[38][39][40][41]. At a fixed temperature T 0 , the complex dielectric or conductivity spectrum is ultimately defined by the polarization or conductance of the total contributing charged microscopic particles.…”