Femtosecond tunneling of polarons in Pb 5 Cr 3 F 19

The complex dielectric constant/ac electrical conductivity was investigated as a function of frequency and temperature in Pb 5 Cr 3 F 19 . The system undergoes a ferroelectric phase transition at higher temperatures. At lower temperatures the real part of the complex ac electric conductivity was fou...

Full description

Saved in:
Bibliographic Details
Published in:Journal of advanced dielectrics 2014-07, Vol.4 (3), p.1450020
Main Authors: Levstik, A., Filipič, C., Tavčar, G., Žemva, B.
Format: Article
Language:English
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The complex dielectric constant/ac electrical conductivity was investigated as a function of frequency and temperature in Pb 5 Cr 3 F 19 . The system undergoes a ferroelectric phase transition at higher temperatures. At lower temperatures the real part of the complex ac electric conductivity was found to follow the universal dielectric response (UDR) σ′ ∝ ν s , typical for hopping or tunneling of localized charge carriers. A detailed analysis of the temperature dependence of the UDR parameter s in terms of the theoretical model for tunneling of small polarons revealed that, at low temperatures, this mechanism governs the charge transport in Pb 5 Cr 3 F 19 . The value of the inverse attempt frequency τ 0 indicates the femtosecond tunneling of polarons in the system similar to the Büttiker–Landauer transversal time.
ISSN:2010-135X
2010-1368
DOI:10.1142/S2010135X14500209