Photoconduction in the Peierls conductor monoclinic TaS${}_3$

Abstract

Photoconduction in the monoclinic phase of quasi-one-dimensional conductor TaS${}_3$ has been observed at $T<70$~K. It was studied jointly with low-temperature ohmic and non-linear dark conduction. The strong sample quality dependence of both photoconduction and dark conduction at this temperature region has been observed. Together with a similarity of the main features of the photoconduction characteristic of both monoclinic ({\it m-}TaS${}_3$) and orthorhombic ({\it o-}TaS${}_3$) samples the following new peculiarities of photoconduction in {\it m-}TaS${}_3$ were found: 1) the dependence of the activation energy of photoconduction on temperature, $T$, 2) the change of the recombination mechanism from the linear type to the collisional one at low $T$ with a sample quality growth, 3) the existence of a fine structure of the electric-field dependence of photoconduction. Spectral study gives the Peierls energy gap value $2{\Delta }^{\ast }=0.18$~eV.

To be published in Physica B

References in corpus (1)

• Charge-density waves physics revealed by photoconduction

Cited by in corpus (2)

• One-Dimensional van der Waals Quantum Materials -- State of the Art and Perspectives
• Charge-density waves physics revealed by photoconduction