Mn位掺杂钙钛矿结构化合物LaSr2Mn2-xNixO7的磁性和电性的研究

被引：4

作者：

石兆辉 ^{[1
]}

冯静 ^{[1
]}

孟健 ^{[2
]}

张密林 ^{[1
]}

机构：

[1] 哈尔滨工程大学化工学院

[2] 中科院长春应用化学研究所稀土化学与物理重点实验室

来源：

无机化学学报 | 2006年 / 08期

关键词：

磁阻; 钙钛矿; 电荷有序; 双交换;

D O I：

暂无

中图分类号：

O482.5 [磁学性质];

学科分类号：

070205 ; 0805 ; 080502 ; 0809 ;

摘要：

The effect of Ni substitution for Mn on magnetic and transport properties has been investigated for layered manganese oxides LaSr2Mn2-xNixO7. Nickel doping hampered the canted antiferromagnetic (AFM) exchange at low temperature and their Neel temperature (TN) decreased from 138 K (x=0) to 102 K (x=0.3). Meanwhile, spin glass, charge ordering and metal-insulator transition are suppressed by Ni addition. The resistivity increases obviously with increasing x due to double exchange interaction channel broken by Ni2+ addition. The resistivity of all samples in low temperature range fits to the Mott′s variable rang hopping (VRH) model, while it fits to nearest neighbor hopping of small polarons model in high temperature range.

引用

页码：1530 / 1534

页数：5