Spin-polarized intergrain tunneling in La-2/Sr-3(1)/3MnO3

被引:1754
作者
Hwang, HY [1 ]
Cheong, SW [1 ]
Ong, NP [1 ]
Batlogg, B [1 ]
机构
[1] PRINCETON UNIV, JOSEPH HENRY LABS PHYS, PRINCETON, NJ 08544 USA
关键词
D O I
10.1103/PhysRevLett.77.2041
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The magnetoresistance (MR) and the field dependent magnetization have been systematically examined in the low temperature ferromagnetic metallic state of single crystal and polycrystalline La2/3Sr1/3MnO3. We find that the intrinsic negative MR in single crystal is due to the suppression of spin fluctuations, and magnetic domain boundaries do not dominate the scattering process. In contrast, we demonstrate that the MR in the polycrystalline samples exhibits two distinct regions: large MR at low fields dominated by spin-polarized tunneling between grains and high field MR which is remarkably temperature independent from 5 to 280 K.
引用
收藏
页码:2041 / 2044
页数:4
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