Field-induced dielectric response saturation in o-TaS3
Yongchang Ma1,2,3, Cuimin Lu1,4, Xuewei Wang1
1School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, People's Republic of China.
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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.
