| Issue |
EPL
Volume 83, Number 2, July 2008
|
|
|---|---|---|
| Article Number | 27001 | |
| Number of page(s) | 4 | |
| Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
| DOI | https://doi.org/10.1209/0295-5075/83/27001 | |
| Published online | 20 June 2008 | |
Polarons in magnetoelectric K3Fe5F15
Jožef Stefan Institute - P. O. Box 3000, SI-1001 Ljubljana, Slovenia, EU
Corresponding author: adrijan.levstik@ijs.si
Received:
4
March
2008
Accepted:
27
May
2008
The ac electrical conductivity of magnetoelectric K3Fe5F15 was investigated as a function of frequency and temperature. While at higher temperatures charge transport is governed by a thermally activated process, at lower temperatures the real part of the complex ac electric conductivity was found to follow the universal dielectric response 
, being typical for hopping or tunnelling of localized charge carriers. A detailed analysis of the temperature dependence of the UDR parameter s in terms of the theoretical model for tunnelling of small polarons revealed that, below 80 K, this mechanism governs the charge transport in the K3Fe5F15 magnetoelectric fluoride system.
PACS: 72.20.Fr – Low-field transport and mobility; piezoresistance / 73.40.Gk – Tunneling / 71.38.-k – Polarons and electron-phonon interactions
© EPLA, 2008
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