Comparison of the magnetotransport properties between (La0.7Pb0.3MnO3)1−xAgx and (La0.7Pb0.3MnO3)1−x(Fe2O3)x composites
Comparison of the magnetotransport properties between (La0.7Pb0.3MnO3)1−xAgx and (La0.7Pb0.3MnO3)1−x(Fe2O3)x composites
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DOI：
10.1016/j.matlet.2005.11.091
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发表时间：
2006-06
影响因子：
3
通讯作者：
S. Young;C. C. Lin-C.;Jen-Bin Shi;Hone-Zern Chen;L. Horng
中科院分区：
文献类型：
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作者：
S. Young;C. C. Lin-C.;Jen-Bin Shi;Hone-Zern Chen;L. Horng
采用化学固相烧结法制备了(La0.7Pb0.3MnO3)1−xAgx和(La0.7Pb0.3MnO3)1−x(Fe2O3)x陶瓷复合材料。研究了这些复合材料的结构和磁输运特性。对于两个体系，随着 Ag 或 Fe2O3 摩尔百分比的增加，铁磁性逐渐受到抑制。 (La0.7Pb0.3MnO3)1−xAgx 的电阻率显着降低，而 (La0.7Pb0.3MnO3)1−x(Fe2O3)x 的电阻率显着增加。建议将Ag引入晶界生态位形成人工导电网络并改善载流子的传输。相反，(La0.7Pb0.3MnO3)1−x(Fe2O3)x复合材料中的Fe2O3充当两个晶粒之间的分离层并形成人工隧道结。然而，这两个系统都观察到磁阻的增强。
Ceramic composites of (La0.7Pb0.3MnO3)1−xAgxand (La0.7Pb0.3MnO3)1−x(Fe2O3)xare prepared by using chemical and solid-sate sintering route. The structural and magnetotransport properties are studied for these composites. Ferromagnetism is gradually suppressed with the increase of Ag or Fe2O3mole percentage for both systems. The resistivity decreases significantly for (La0.7Pb0.3MnO3)1−xAgxwhile resistivity increases dramatically for (La0.7Pb0.3MnO3)1−x(Fe2O3)x. It is suggested that the introduction of Ag into the niche of grain boundaries forms artificial conducting network and improve the carriers to transport. Contrarily, the Fe2O3in (La0.7Pb0.3MnO3)1−x(Fe2O3)xcomposite acts as a separation layer between two grains and forms the artificial tunneling junction. However, the enhancement of magnetoresistance has been observed for both systems.