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題名: Transport Behavior of Yttrium Substituted Polycrystalline La0.7Pb0.3MnO3
作者: Lin, C. H.;Young, S. L.;Chen, H. Z.;Ou, C. R.;Kao, M. C.;Horng, Lance
貢獻者: 物理學系
關鍵詞: Ceramics;Conductivity;Magnetic properties
日期: 2008-12
上傳時間: 2013-02-05T02:20:22Z
出版者: Elsevier
摘要: The transport properties in La0.7−xYxPb0.3MnO3 (0.0 ⩽ x ⩽ 0.2) is investigated. The substitution of La3+ ions by smaller nonmagnetic Y3+ leads to greater spin disorder and induces variations in the magnetotransport behavior. From resistivity versus temperature curves a metal–insulator transition phenomenon is observed at the transition temperature, TP, decreases as the Y content increases. The resistivity is well fitted using the equation ρ(T) = ρnexp[(T∗/T)n] with n = 1/4 and n = 1/2 at high and intermediate temperatures, respectively. The characteristic temperature T∗ varies with Y content in a manner consistent with the localization model of variable range hopping. Below TP, resistivity varies as a function of power law contributions, ρ = ρ0 + ρ2T2 + ρ5/2T5/2, corresponding to the electron scattering processes in the ferromagnetic phase.
關聯: Journal of Non-Crystalline Solids, 354(47-51): 5290-5291
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