Superionic Conductivity in One-Dimensional Nanofibrous TlGaTe2 Crystals

We study the temperature dependence of the electrical conductivity $\sigma(T)$ of TlGaTe 2 crystals under an electric field ($E = 181$ V/cm). A strong sharp increase ($\times 1500$) in $\sigma(T)$ is observed at $T = 242$ K (along the $c$-axis) and $T = 267$ K (perpendicular to it). This increase is...

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Bibliographic Details
Published in:Jpn J Appl Phys 2011-05, Vol.50 (5), p.05FC09-05FC09-2
Main Authors: Sardarly, Rauf, Samedov, Oktay, Abdullayev, Adil, Salmanov, Famin, Urbanovic, Andzej, Garet, Frédéric, Coutaz, Jean-Louis
Format: Article
Language:English
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Summary:We study the temperature dependence of the electrical conductivity $\sigma(T)$ of TlGaTe 2 crystals under an electric field ($E = 181$ V/cm). A strong sharp increase ($\times 1500$) in $\sigma(T)$ is observed at $T = 242$ K (along the $c$-axis) and $T = 267$ K (perpendicular to it). This increase is attributed to a transition towards a superionic conductivity behavior. Over the superionic transition threshold, disordering of the Tl + sublattice in TlGaTe 2 occurs, and nanoscale topological disordering arises owing to aperiodicity in placing Ga 3+ Te 2 2- nanofibers. Terahertz time-domain spectroscopy reveals absorption lines at approximately 0.2 THz that may be attributed to the libration oscillations of the nanofibers.
ISSN:0021-4922
1347-4065
DOI:10.1143/JJAP.50.05FC09