Grain-boundary effects on the magnetoresistance properties of perovskite manganite films

被引：641

作者：

Gupta, A

Gong, GQ

Xiao, G

Duncombe, PR

Lecoeur, P

Trouilloud, P

Wang, YY

Dravid, VP

Sun, JZ

机构：

[1] BROWN UNIV,DEPT PHYS,PROVIDENCE,RI 02912

[2] NORTHWESTERN UNIV,DEPT MAT SCI & ENGN,EVANSTON,IL 60208

来源：

PHYSICAL REVIEW B | 1996年 / 54卷 / 22期

关键词：

D O I：

10.1103/PhysRevB.54.R15629

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The role of grain boundaries in the magnetoresistance (MR) properties of the manganites has been investigated by comparing the properties of epitaxial and polycrystalline films of La0.67D0.33MnO3-delta (D = Ca, Sr, or vacancies). While the MR in the epitaxial films is strongly peaked near the ferromagnetic transition temperature and is very small at low temperatures, the polycrystalline films show large MR over a wide temperature range down to 5 K. The results are explained in terms of switching of magnetic domains in the grains and disorder-induced canting of Mn spins in the grain-boundary region.

引用

页码：15629 / 15632

页数：4

共 21 条

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