Enhanced intergrain tunneling magnetoresistance in double perovskite Sr2FeMoO6 polycrystals with nanometer-scale particles

被引：114

作者：

Yuan, CL ^{[1
]}

Wang, SG ^{[1
]}

Song, WH ^{[1
]}

Yu, T ^{[1
]}

Dai, JM ^{[1
]}

Ye, SL ^{[1
]}

Sun, YP ^{[1
]}

机构：

[1] Acad Sinica, Inst Solid State Phys, Hefei 230031, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 1999年 / 75卷 / 24期

关键词：

D O I：

10.1063/1.125478

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Polycrystalline ordered double perovskite Sr2FeMoO6 bulk samples with grain size in the range of 29-45 nm have been synthesized at temperatures from 900 to 1000 degrees C, using a sol-gel method. We find that the intergrain magnetoresistance is closely correlated with the grain size. The sample with the grain size of 29 nm shows large magnetoresistance Delta rho/rho(0), 30%-20% at a low magnetic field of 4 kG over a wide temperature range from 20 to 300 K. The results can be explained in terms of spin-dependent intergrain tunneling model. (C) 1999 American Institute of Physics. [S0003-6951(99)02050-1].

引用

页码：3853 / 3855

页数：3

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