Grain size effect on the colossal magnetoresistance in granular perovskite La0.7Pb0.3MnO3

被引：1

作者：

Young, S. L.

Chen, H. Z.

Kao, M. C.

Horng, L.

Wu, K. M.

Ho, Y. W.

Shih, Y. T.

机构：

[1] Hsiuping Inst Technol, Dept Elect Engn, Taichung 412, Taiwan

[2] Natl Changhua Univ Educ, Dept Phys, Changhua 500, Taiwan

来源：

MODERN PHYSICS LETTERS B | 2006年 / 20卷 / 29期

关键词：

granular; perovskite; magnetoresistance; magnetotransport;

D O I：

10.1142/S021798490601202X

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Magnetic behaviors and transport properties in granular perovskite La0.7Pb0.3MnO3 with different grain sizes have been synthesized. The results show that magnetic susceptibility, ferromagnetic ordering temperature and magnetoresistance are affected by the grain size. These compounds with different grain sizes exhibit two kinds of magnetoresistance origins, intragrain double exchange and intergrain interfacial tunneling. With the increasing grain size, the intrinsic transport is dominant while the extrinsic tunneling gradually disappears. Thus, the basis of magnetotransport mechanism is the result of competition between the double exchange interaction and the interfacial tunneling effect.

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页码：1859 / 1865

页数：7

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