Transport behavior and mechanism of conduction of simultaneously substituted Y and Fe in La0.7Ba0.3MnO3 perovskite
In: ISSN: 0921-4526 ; EISSN: 1873-2135, 2011
academicJournal
Zugriff:
International audience ; 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.
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Transport behavior and mechanism of conduction of simultaneously substituted Y and Fe in La0.7Ba0.3MnO3 perovskite
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Autor/in / Beteiligte Person: | Ben Abdelkhalek, Sonia ; Kallel, Nabil ; Kallel, Sami ; Guizouarn, Thierry ; Peña, Octavio ; Oumezzine, Mohamed ; Institut des Sciences Chimiques de Rennes (ISCR) ; Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes) ; Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS) |
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Zeitschrift: | ISSN: 0921-4526 ; EISSN: 1873-2135, 2011 |
Veröffentlichung: | HAL CCSD ; Elsevier, 2011 |
Medientyp: | academicJournal |
ISSN: | 0921-4526 |
DOI: | 10.1016/j.physb.2011.07.048 |
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