The relationship between electrical and magnetic properties of manganites has been traced through the analysis of dependence of La0.47Eu0.2Pb0.33MnO3 (LEPMO) and La0.47Y0.2Pb0.33MnO3 (LYPMO) resistivity on temperature. The dependence of electrical resistivity on temperature shows a metal–semiconductor transition at TM-Sc and a decrease in TM-sc with Eu and Y substitution. The critical property of both systems around second order transition was investigated using Fisher–Langer relation and Suezaki–Mori method. The obtained exponents values from resistivity were so close to those predicted by the 3D-Ising model. These results and the analysis of the critical exponents from magnetization measurements were in good agreement. For low temperatures (T < TM-Sc), the electrical conduction process obeys the Scattering model defined by $$\rho (T) = \rho_{0} + \rho_{2} T^{2} + \rho_{5} T^{5}$$ . While for T > TM-Sc, for the two samples, the mechanism of electrical conduction is governed by the thermal activation model defined by $$\rho = \rho_{0} T\exp (E_{\text{a}} /k_{\text{B}} T)$$ . In order to understand the transport mechanism in the whole temperature range, the phenomenological percolation model, based on the phase segregation of ferromagnetic metallic clusters and paramagnetic insulating regions, was used in fitting the electrical resistivity. Therefore, it was found that the estimated values of the resistivity are in good agreement with experimental data. Magnetoresistance study showed a peak that has a great value around the transition temperature (TM-Sc).

中文翻译：

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La0.47Ln0.2Pb0.33MnO3（Ln = Y和Eu）多晶中的临界行为及其与磁电特性的相关性

通过分析 La0.47Eu0.2Pb0.33MnO3 (LEPMO) 和 La0.47Y0.2Pb0.33MnO3 (LYPMO) 电阻率对温度的依赖性，可以追溯锰酸盐的电学和磁学特性之间的关系。电阻率对温度的依赖性显示了 TM-Sc 处的金属-半导体转变，并且随着 Eu 和 Y 的取代，TM-sc 降低。使用 Fisher-Langer 关系和 Suezaki-Mori 方法研究了两个系统围绕二阶跃迁的临界性质。从电阻率获得的指数值与 3D-Ising 模型预测的值非常接近。这些结果和对磁化测量的关键指数的分析非常吻合。对于低温 (T < TM-Sc)，导电过程遵循由 $$\rho (T) = \rho_{0} + \rho_{2} T^{2} + \rho_{5} T^{5}$$ 定义的散射模型。而对于 T > TM-Sc，对于两个样品，导电机制由 $$\rho = \rho_{0} T\exp (E_{\text{a}} / k_{\text{B}} T)$$ 。为了理解整个温度范围内的传输机制，基于铁磁金属簇和顺磁绝缘区域的相分离的现象学渗透模型被用于拟合电阻率。因此，发现电阻率的估计值与实验数据非常吻合。磁阻研究表明在转变温度 (TM-Sc) 附近有一个峰值。而对于 T > TM-Sc，对于两个样品，导电机制由 $$\rho = \rho_{0} T\exp (E_{\text{a}} / k_{\text{B}} T)$$ 。为了理解整个温度范围内的传输机制，基于铁磁金属簇和顺磁绝缘区域的相分离的现象学渗透模型被用于拟合电阻率。因此，发现电阻率的估计值与实验数据非常吻合。磁阻研究表明在转变温度 (TM-Sc) 附近有一个峰值。而对于 T > TM-Sc，对于两个样品，导电机制由 $$\rho = \rho_{0} T\exp (E_{\text{a}} / k_{\text{B}} T)$$ 。为了理解整个温度范围内的传输机制，基于铁磁金属簇和顺磁绝缘区域的相分离的现象学渗透模型被用于拟合电阻率。因此，发现电阻率的估计值与实验数据非常吻合。磁阻研究表明在转变温度 (TM-Sc) 附近有一个峰值。导电机制由 $$\rho = \rho_{0} T\exp (E_{\text{a}} /k_{\text{B}} T)$$ 定义的热激活模型控制。为了理解整个温度范围内的传输机制，基于铁磁金属簇和顺磁绝缘区域的相分离的现象学渗透模型被用于拟合电阻率。因此，发现电阻率的估计值与实验数据非常吻合。磁阻研究表明在转变温度 (TM-Sc) 附近有一个峰值。导电机制由 $$\rho = \rho_{0} T\exp (E_{\text{a}} /k_{\text{B}} T)$$ 定义的热激活模型控制。为了理解整个温度范围内的传输机制，基于铁磁金属簇和顺磁绝缘区域的相分离的现象学渗透模型被用于拟合电阻率。因此，发现电阻率的估计值与实验数据非常吻合。磁阻研究表明在转变温度 (TM-Sc) 附近有一个峰值。基于铁磁金属簇和顺磁绝缘区域的相分离，用于拟合电阻率。因此，发现电阻率的估计值与实验数据非常吻合。磁阻研究表明在转变温度 (TM-Sc) 附近有一个峰值。基于铁磁金属簇和顺磁绝缘区域的相分离，用于拟合电阻率。因此，发现电阻率的估计值与实验数据非常吻合。磁阻研究表明在转变温度 (TM-Sc) 附近有一个峰值。