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http://ir.ncue.edu.tw/ir/handle/987654321/15426
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| Title: | Transport Behavior of Yttrium Substituted Polycrystalline La0.7Pb0.3MnO3 |
| Authors: | Lin, C. H.;Young, S. L.;Chen, H. Z.;Ou, C. R.;Kao, M. C.;Horng, Lance |
| Contributors: | 物理學系 |
| Keywords: | Ceramics;Conductivity;Magnetic properties |
| Date: | 2008-12
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| Issue Date: | 2013-02-05T02:20:22Z
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| Publisher: | Elsevier |
| Abstract: | 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. |
| Relation: | Journal of Non-Crystalline Solids, 354(47-51): 5290-5291 |
| Appears in Collections: | [物理學系] 期刊論文
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