Possible origin of nonlinear conductivity and large dielectric constant in the commensurate charge-density-wave phase of 1TTaS2

Yongchang Ma, Yanhui Hou, Cuimin Lu, Lijun Li, and Cedomir Petrovic
Phys. Rev. B 97, 195117 – Published 10 May 2018

Abstract

The electric field dependence of the dielectric properties and the nonlinear conductance of 1TTaS2 below 50 K has been investigated. A large dielectric constant of about 104 is obtained up to 107 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 ε1(ω) decreases. We propose that the separation of bound soliton-antisoliton pairs may be a contributor to the reduction of ε1(ω) and the accompanying nonlinear conductivity with increasing dc bias.

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  • Received 27 June 2017
  • Revised 18 April 2018

DOI:https://doi.org/10.1103/PhysRevB.97.195117

©2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Yongchang Ma1,2,3,*, Yanhui Hou1, Cuimin Lu1,4, Lijun Li2,†, and Cedomir Petrovic2

  • 1School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China
  • 2Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA
  • 3Key Laboratory of Display Materials and Photoelectric Devices (Tianjin University of Technology), Ministry of Education, Tianjin 300384, China
  • 4Tianjin Key Lab for Photoelectric Materials and Devices, Tianjin 300384, China

  • *ycma@tjut.edu.cn
  • Permanent address: Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China.

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Vol. 97, Iss. 19 — 15 May 2018

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