Electrical Conduction and Percolation Model in Pr0.6Ca0.1Sr0.3Mn1−xFe x O3 (x = 0, 0.05, and 0.075) Manganites
| Autor: | M. Baazaoui, Saoussen Mahjoub, Mohamed Oumezzine, Nassira Chniba Boudjada, Rafik M’nassri |
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| Přispěvatelé: | Matériaux, Rayonnements, Structure (MRS), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF), Laboratoire Physico-Chimie des Matériaux [Monastir], Faculté des Sciences de Monastir (FSM), Université de Monastir - University of Monastir (UM)-Université de Monastir - University of Monastir (UM) |
| Rok vydání: | 2015 |
| Předmět: |
[PHYS]Physics [physics]
Materials science Condensed matter physics 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics Polaron 01 natural sciences Variable-range hopping Electronic Optical and Magnetic Materials Magnetization Paramagnetism Ferromagnetism Electrical resistivity and conductivity Phase (matter) 0103 physical sciences Volume fraction 010306 general physics 0210 nano-technology ComputingMilieux_MISCELLANEOUS |
| Zdroj: | Journal of Superconductivity and Novel Magnetism Journal of Superconductivity and Novel Magnetism, Springer Verlag, 2015, 28 (7), pp.1905-1911. ⟨10.1007/s10948-015-3065-y⟩ |
| ISSN: | 1557-1947 1557-1939 |
| DOI: | 10.1007/s10948-015-3065-y |
| Popis: | We have investigated the electrical proprieties of Pr 0.6Ca 0.1Sr 0.3Mn 1−xFe x O 3(x= 0, 0.05, and 0.075) manganites. All the samples undergo a metal–insulator transition at T M−I accompanying the ferromagnetic–paramagnetic transition. Low-temperature resistivity (ρ) data below T M−I have been relatively well fitted with the relation ρ=ρ 0+ρ 2 T 2+ρ 4.5 T 4.5. Above T M−I, the resistivity were explained using variable range hopping (VRH) and small polaron hopping (SPH) models. Based on the phase segregation of ferromagnetic–metallic regions and paramagnetic–insulator regions, overall data for temperature dependence of resistivity for these samples has been best-fitted using the formula ρ(T)=ρ FM f+ρ PM(1−f), where PM and FM are the resistivity of the paramagnetic (PM) and ferromagnetic (FM) regions in these samples and f is the volume fraction of FM phase. The estimated results are in good agreement with the experimental data. Moreover, we also found that the volume fraction of the ferromagnetic phase f has the same physical meaning as the reduced magnetization. |
| Databáze: | OpenAIRE |
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