Transport behavior and mechanism of conduction of simultaneously substituted Y and Fe in La0.7Ba0.3MnO3 perovskite - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Physica B: Condensed Matter Année : 2011

Transport behavior and mechanism of conduction of simultaneously substituted Y and Fe in La0.7Ba0.3MnO3 perovskite

Sonia Ben Abdelkhalek
  • Fonction : Auteur
Nabil Kallel
  • Fonction : Auteur
Sami Kallel
  • Fonction : Auteur
Thierry Guizouarn
  • Fonction : Auteur
  • PersonId : 917885
Mohamed Oumezzine
  • Fonction : Auteur

Résumé

The electrical properties and the mechanism of conduction of the simultaneously substituted La0.7−xYxBa0.3Mn1−xFexO3 perovskite (0≤x≤0.30) have been studied. The insertion of Y3+ and Fe3+ ions in the parent compound La0.7Ba0.3MnO3 leads to an increase of the resistivity. The undoped sample (x=0) shows a metallic behavior, which can be fitted by the relation ρ(T)=ρ0+ρ2T2+ρ4.5T4.5, indicating the importance of electron-magnon scattering effects in this material. All the other samples (x≥0.10) are semiconductors throughout the studied temperature range (80-290 K). Several models have been used to fit their temperature-dependent resistivity: thermal activation, adiabatic nearest-neighbor hopping of small polarons (Holstein theory) and variable range hopping (VRH) models. The fits show that the electronic transport in semiconducting La0.7−xYxBa0.3Mn1−xFexO3 is well described and dominated by the VRH mechanism, for which the hopping distance (a) grows with increasing Fe3+ doping, thus increasing the average hopping energy W.

Domaines

Matériaux

Dates et versions

hal-00825614 , version 1 (24-05-2013)

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Sonia Ben Abdelkhalek, Nabil Kallel, Sami Kallel, Thierry Guizouarn, Octavio Peña, et al.. Transport behavior and mechanism of conduction of simultaneously substituted Y and Fe in La0.7Ba0.3MnO3 perovskite. Physica B: Condensed Matter, 2011, 406 (21), pp.4060-4067. ⟨10.1016/j.physb.2011.07.048⟩. ⟨hal-00825614⟩
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