Twin-micro structure enhanced magnetoresistance in La0.67Ba0.33MnO3 oxides

被引：4

作者：

Zhang, Y. B. ^{[1
]}

Li, S.

Sun, C. Q.

Sritharan, T.

机构：

[1] Nanyang Technol Univ, Sch Mat Sci & Engn, Singapore 639798, Singapore

[2] Univ New S Wales, Sch Mat Sci & Engn, Sydney, NSW 2052, Australia

[3] Nanyang Technol Univ, Sch Elect & Elect Engn, Singapore 639798, Singapore

来源：

SOLID STATE COMMUNICATIONS | 2006年 / 139卷 / 10期

关键词：

grain boundaries; electronic transport;

D O I：

10.1016/j.ssc.2006.07.024

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The grain growth dependence of microstructure and its effects on magnetic and transport properties are studied in the polycrystalline La0.67Ba0.33MnO3 oxides. It is found that a lateral growth manner along a certain direction and a concentric terrace pattern along three orthogonal axes occur in the samples sintered at 1573 and 1673 K, respectively. Lamella-like twin microstructure forms in the concentric terrace growth pattern and the magnetoresistance properties can be enhanced by the twin microstructure. It suggests that the twin-boundaries in twin-grains may possibly induce spin-dependent scattering of electrons that is field reduced, or spin-polarized tunneling of electrons that is field enhanced, thus strengthening the effect of grain boundaries. (c) 2006 Elsevier Ltd. All rights reserved.

引用

页码：506 / 510

页数：5

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