Intergranular tunnelling and field-induced percolation fluctuation of granular composites (La1-zAgzMnO3)/(MnO2/Mn2O3)

被引：0
|
作者：
Zhang, N [1 ]
Bao, JC
Li, G
Geng, T
Chen, JK
机构：
[1] Nanjing Normal Univ, Dept Phys, Nanjing 210097, Peoples R China
[2] Nanjing Normal Univ, Dept Chem, Nanjing 210097, Peoples R China
[3] Nanjing Normal Univ, Ctr Anal & Measurement, Nanjing 210097, Peoples R China
[4] Shanghai Univ Sci & Technol, Dept Phys, Shanghai 200000, Peoples R China
来源：
CHINESE PHYSICS LETTERS | 2005年 / 22卷 / 11期
关键词：
D O I：
10.1088/0256-307X/22/11/059
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We investigate the giant magnetoresistance of composites (La1-zAgzMnO3)(1-y)(MnO2/Mn2O3)(y). The magnetoresistive property of the composites shows the characteristics of intergranular tunnelling. A conductivity leap has been observed around y = 0.7. The composite (La0.926Ag0.074MnO3)(0.698)(MnO2/Mn2O3)(0.302) has been found to show the greatest magnetoresistance in the samples. Its room-temperature MR ratio reaches 24% under a field of 1.8 T. These phenomena suggest a percolation transformation and a kind of field-induced fluctuation in percolation in the samples investigated.
引用
收藏
页码：2940 / 2943
页数：4
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