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Electrical Conduction and Percolation Model in Pr0.6Ca0.1Sr0.3Mn1−xFe x O3 (x = 0, 0.05, and 0.075) Manganites

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Abstract

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.

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Authors and Affiliations

  1. Laboratoire de Physico-Chimie des Matériaux, Département de Physique, Faculté des Sciences de Monastir, Université de Monastir, 5019, Monastir, Tunisia

    Saoussen Mahjoub, Mohamed Baazaoui, Rafik M’nassri & Mohamed Oumezzine

  2. Higher Institute of Applied Sciences and Technology of Kasserine, Kairouan University, BP 471, 1200, Kasserine, Tunisia

    Rafik M’nassri

  3. Institut NEEL, B.P. 166, 38042, Grenoble Cedex 9, France

    Nassira Chniba Boudjada

Authors
  1. Saoussen Mahjoub
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  2. Mohamed Baazaoui
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  3. Rafik M’nassri
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  4. Nassira Chniba Boudjada
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  5. Mohamed Oumezzine
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Correspondence to Saoussen Mahjoub.

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Mahjoub, S., Baazaoui, M., M’nassri, R. et al. Electrical Conduction and Percolation Model in Pr0.6Ca0.1Sr0.3Mn1−xFe x O3 (x = 0, 0.05, and 0.075) Manganites. J Supercond Nov Magn 28, 1905–1911 (2015). https://doi.org/10.1007/s10948-015-3065-y

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  • DOI: https://doi.org/10.1007/s10948-015-3065-y

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