Possible origin of nonlinear conductivity and large dielectric constant in the commensurate charge-density-wave phase of 1T−TaS2
| Autor: | Yongchang Ma, Yanhui Hou, Cedomir Petrovic, Cuimin Lu, Lijun Li |
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| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | Physical Review B. 97 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.97.195117 |
| Popis: | The electric field dependence of the dielectric properties and the nonlinear conductance of $1T\text{\ensuremath{-}}{\mathrm{TaS}}_{2}$ below 50 K has been investigated. A large dielectric constant of about ${10}^{4}$ is obtained up to ${10}^{7}$ 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 ${\ensuremath{\epsilon}}_{1}(\ensuremath{\omega})$ decreases. We propose that the separation of bound soliton-antisoliton pairs may be a contributor to the reduction of ${\ensuremath{\epsilon}}_{1}(\ensuremath{\omega})$ and the accompanying nonlinear conductivity with increasing dc bias. |
| Databáze: | OpenAIRE |
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