The ultra-high-TP charge-density wave in the monoclinic phase of NbS3

We report on high temperature (T) studies of conductivity, sigma, of the monoclinic phase of NbS3 (NbS3-II). The compound is shown to be stable up to T similar to 550 K. Threshold non-linear conductivity and Shapiro steps on the I - V curves can be seen up to T-P0 approximate to 450 - 475 K clearly demonstrating sliding of a charge-density wave (CDW). The feature in sigma(T) shows that T-P0 is the temperature of the formation of this CDW. The charges condensed in this CDW show relatively high density and, at the same time, extremely low mobility. Their mobility appears low in the single-particle states as well, giving a plausible clue to the surprising dielectric-like temperature variation of sigma above T-P0. (C) 2020 Elsevier B.V. All rights reserved.

Automated summary

High temperature studies of the monoclinic phase of NbS3 (NbS3-II) show stable behavior up to around 550K, with clear evidence of charge-density wave (CDW) sliding around 450-475K. The high density charges condensed in the CDW exhibit extremely low mobility, leading to surprising dielectric-like temperature variations in conductivity above the CDW formation temperature.