6533b86dfe1ef96bd12c9f79
RESEARCH PRODUCT
Frequency and temperature dependence of the electrical conductivity of KTaO3; Li and PbTiO3; La, Cu: Indication of a low temperature polaron mechanism
Olivier BidaultAdrijan LevstikCene FilipičMario Maglionesubject
Colossal magnetoresistanceMaterials science02 engineering and technologyDielectricPolaron01 natural sciencesTunnellingTunnel effectElectrical resistivity and conductivityTantalates0103 physical sciencesElectrical and Electronic Engineering010306 general physicsQuantum tunnellingLow-field transportSuperconductivityCondensed matter physicsPACS: 72.20.Fr; 73.40.Gk; 71.38.−k; 77.84.DyPolaronsDoping[CHIM.MATE]Chemical Sciences/Material chemistry021001 nanoscience & nanotechnologyCondensed Matter PhysicsElectronic Optical and Magnetic Materials[ CHIM.MATE ] Chemical Sciences/Material chemistry0210 nano-technologyTitanatesdescription
Abstract Recently, the concept of polarons has again been at the focus of solid-state research, as it can constitute the basis for understanding the high-temperature superconductivity or the colossal magnetoresistance of materials. More than a decade ago there were some indications that polarons play an important role in explaining low temperature maxima in imaginary part of the dielectric constant e ″ ( T ) in ABO3 perovskites. In the present work we report the ac electrical conductivities of KTaO3; Li and PbTiO3; La, Cu and their frequency and temperature dependence. The real part of the complex ac conductivity was found to follow the universal dielectric response σ ′ ∝ ν s . A detailed theoretical analysis of the temperature dependence of the parameter s revealed that, at low temperatures, the tunnelling of small polarons is the dominating charge transport mechanism in ABO3 perovskites.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2008-10-01 |