Ferromagnetic cluster behaviors and magnetoresistance in Ni-doped LaSrMnO3 systems

被引：36

作者：

Feng, JW

Hwang, LP ^{[1
]}

机构：

[1] Natl Taiwan Univ, Dept Chem, Taipei 10764, Taiwan

[2] Acad Sinica, Inst Atom & Mol Sci, Taipei, Taiwan

来源：

APPLIED PHYSICS LETTERS | 1999年 / 75卷 / 11期

关键词：

D O I：

10.1063/1.124764

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We have studied the magnetic and magnetotransport properties of the perovskites La8Sr0.2Mn8Ni0.2O3 and La0.7Sr0.3Mn0.8Ni0.2O3. Ferromagnetic cluster behaviors have been observed. The most interesting feature is that the cluster-glass state exhibits both macroscopic insulator-like transport behavior and largely enhanced magnetoresistance (MR) at low temperature. Such a low-temperature MR is weakly temperature dependent. In particular, a low-temperature magnetoresistance ratio (Delta rho/rho(0)) as high as 60% has been found in La0.7Sr0.3Mn0.8Ni0.2O3. We attribute the low-temperature magnetotransport to the spin-dependent scattering inside the grains. (C) 1999 American Institute of Physics. [S0003-6951(99)01737-4].

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页码：1592 / 1594

页数：3

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