Electrical Conduction and Percolation Model in Pr0.6Ca0.1Sr0.3Mn1−xFexO3 (x = 0, 0.05, and 0.075) Manganites
Electrical Conduction and Percolation Model in Pr0.6Ca0.1Sr0.3Mn1−xFexO3 (x = 0, 0.05, and 0.075) Manganites
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Pr0.6Ca0.1Sr0.3Mn1−xFexO3 (x = 0、0.05 和 0.075) 锰酸盐中的导电和渗流模型
DOI：
10.1007/s10948-015-3065-y
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发表时间：
2015
影响因子：
1.8
通讯作者：
M. Oumezzine
中科院分区：
文献类型：
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作者：
S. Mahjoub;M. Baazaoui;R. M’nassri;N. Boudjada;M. Oumezzine
我们研究了 Pr0.6Ca0.1Sr0.3Mn1−xFexO3(x= 0、0.05 和 0.075) 亚锰酸盐的电学性质。所有样品在 TM−I 处经历金属-绝缘体转变，并伴随着铁磁-顺磁转变。 TM−I 下面的低温电阻率（ρ）数据已经较好地拟合了关系式ρ=ρ0+ρ2T2+ρ4.5T4.5。上述TM−I，使用可变范围跳变（VRH）和小极化子跳变（SPH）模型解释了电阻率。基于铁磁-金属区域和顺磁-绝缘体区域的相偏析，这些样品的电阻率温度依赖性的总体数据已使用公式ρ(T)=ρFMf+ρPM(1−f)进行了最佳拟合，其中PM和FM是这些样品中顺磁(PM)和铁磁(FM)区域的电阻率，f是FM相的体积分数。估计结果与实验数据吻合良好。此外，我们还发现铁磁相的体积分数f与约化磁化强度具有相同的物理意义。
We have investigated the electrical proprieties of Pr0.6Ca0.1Sr0.3Mn1−xFexO3(x= 0, 0.05, and 0.075) manganites. All the samples undergo a metal–insulator transition atTM−Iaccompanying the ferromagnetic–paramagnetic transition. Low-temperature resistivity (ρ) data belowTM−Ihave been relatively well fitted with the relationρ=ρ0+ρ2T2+ρ4.5T4.5. AboveTM−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 formulaρ(T)=ρFMf+ρPM(1−f), where PM and FM are the resistivity of the paramagnetic (PM) and ferromagnetic (FM) regions in these samples andfis 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 phasefhas the same physical meaning as the reduced magnetization.