The structure and magnetotransport properties of La2/3Sr1/3MnO3/Ba(La)TiO3 composites

被引：11
作者：
Zhou, Z. Y. [1 ]
Luo, G. S. [1 ]
Jiang, F. Y. [1 ]
机构：
[1] Nanchang Univ, Sch Mat Sci & Engn, Nanchang 330031, Jiangxi, Peoples R China
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2009年 / 321卷 / 13期
关键词：
Manganites; Magnetoresistance; Spin-dependent scattering and tunneling; LOW-FIELD MAGNETORESISTANCE; TRANSPORT-PROPERTIES; TEMPERATURE; PERCOLATION;
D O I：
10.1016/j.jmmm.2008.12.024
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effect of Ba(La)TiO3 doping on the structure and magnetotransport properties of La2/3Sr1/3MnO3(LSMO)/xBa(La)TiO3 (x = 0.0, 1.0, 5.0 mol%) have been investigated. The X-ray diffraction patterns and microstructural analysis show that BaTiO3 and LSMO phases exist independently in BaTiO3-doped composites. The metal-insulator transition temperature (T-MI) decreases whereas the maximum resistivity increases very quickly by the increase of BaTiO3 doping level. The partial substitution of Ba by La(0.35 mol%) results in a decrease in resistivity of LSMO/xBa(La) TiO3 composites. Magnetoresistance of BaTiO3-doped composites decreases monotonously in the temperature range 200-400 K in a magnetic field of 5 T, which is completely different from that of LSMO compound. The value of MR decreases at low field (H<1 T) and increases at high fields (H>1 T) with increasing the BaTiO3 doping level at low temperatures below 280 K. These investigations reveal that the magnetotransport properties of LSMO/xBa(La) TiO3 composites are dominated by spin-dependent scattering and tunneling effect at the LSMO/BaTiO3/LSMO magnetic tunnel junction. (C) 2008 Elsevier B. V. All rights reserved.
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页码：1919 / 1923
页数：5
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