Transport behavior and mechanism of conduction of simultaneously substituted Y and Fe in La<subscript>0.7</subscript>Ba<subscript>0.3</subscript>MnO<subscript>3</subscript> perovskite
In: Physica B, Jg. 406 (2011-11-01), Heft 21, S. 4060-4067
Online
academicJournal
Zugriff:
Abstract: The electrical properties and the mechanism of conduction of the simultaneously substituted La0.7−x Y x Ba0.3Mn1−x Fe x O3 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)=ρ 0+ρ 2T2+ρ 4.5T4.5, 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 (80–290K). 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−x Y x Ba0.3Mn1−x Fe x O3 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. [Copyright &y& Elsevier]
Titel: |
Transport behavior and mechanism of conduction of simultaneously substituted Y and Fe in La<subscript>0.7</subscript>Ba<subscript>0.3</subscript>MnO<subscript>3</subscript> perovskite
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Autor/in / Beteiligte Person: | Abdelkhalek, Sonia Ben ; Kallel, Nabil ; Kallel, Sami ; Guizouarn, Thierry ; Peña, Octavio ; Oumezzine, Mohamed |
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Zeitschrift: | Physica B, Jg. 406 (2011-11-01), Heft 21, S. 4060-4067 |
Veröffentlichung: | 2011 |
Medientyp: | academicJournal |
ISSN: | 0921-4526 (print) |
DOI: | 10.1016/j.physb.2011.07.048 |
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