Effect of second introduced phase on magnetotransport properties of La2/3Sr1/3MnO3/0.33（CuO, ZnO, Al2O3） composites

The structure, magnetic and magnetotransport properties of La2/3Sr1/3MnO3（LSMO）/0.33（CuO, ZnO, Al2O3） composites were investigated to explore the role of second introduced phase. The microstructural analysis shows two kinds of grain boundaries： LSMO/LSMO and LSMO/second phase/LSMO. Two maximal resis...

Full description

Saved in:
Bibliographic Details
Published in:Transactions of Nonferrous Metals Society of China 2008, Vol.18 (4), p.890-896
Main Author: 周正有 吴小山 罗广圣 江风益
Format: Article
Language:English
Subjects:
磁致电阻
磁输运性质
镧锶锰复合氧化物
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The structure, magnetic and magnetotransport properties of La2/3Sr1/3MnO3（LSMO）/0.33（CuO, ZnO, Al2O3） composites were investigated to explore the role of second introduced phase. The microstructural analysis shows two kinds of grain boundaries： LSMO/LSMO and LSMO/second phase/LSMO. Two maximal resistivities appear in LSMO/0.33CuO and LSMO/0.33ZnO composites while the resistivity of LSMO/0.33Al2O3 decreases monotonically with increasing the temperature from 200 K to 400 K. Moreover, the temperature dependence of magnetoresistance（MR） of LSMO/0.33A1203 that decreases monotonically with increasing the temperature is different from that of LSMO/0.33CuO and LSMO/0.33ZnO. A developed two-channel model consisting of scattering model and tunneling model was proposed to fit the resistivity—temperature curves of these composites. The role of second introduced phase and the magnetotransport mechanism of these composites were elucidated.
ISSN:1003-6326