Abstract
The frequency and temperature dependences of the magnetic susceptibility and the ac electrical conductivity in magnetoelectric K3FeII3CrIII2F15 were investigated. The zero-field-cooled-field-heated magnetic susceptibility reveals phase transitions at 14.2 and 36.6 K. The phase below 36.6 K is ferromagnetic. At temperatures below 200 K, the ac conductivity and dielectric constant follow the universal dielectric response (UDR), being 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 below 200 K, this mechanism governs the charge transport in the magnetoelectric fluoride system.
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