无机化学学报

Mn位掺杂钙钛矿结构化合物LaSr₂Mn_2-xNi_xO₇的磁性和电性的研究

Effect of Ni Doping on Magnetic and Electrical Properties in LaSr₂Mn_2-xNi_xO₇

作者	单位
石兆辉	哈尔滨工程大学化工学院，哈尔滨 150001
冯静	哈尔滨工程大学化工学院，哈尔滨 150001 中科院长春应用化学研究所稀土化学与物理重点实验室，长春 130022
孟健	中科院长春应用化学研究所稀土化学与物理重点实验室，长春 130022
张密林	哈尔滨工程大学化工学院，哈尔滨 150001

摘要:

关键词: 磁阻钙钛矿电荷有序双交换

基金项目:

Abstract: The effect of Ni substitution for Mn on magnetic and transport properties has been investigated for layered manganese oxides LaSr₂Mn_2-xNi_xO₇. Nickel doping hampered the canted antiferromagnetic (AFM) exchange at low temperature and their Neel temperature (T_N) 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.

Keywords: magnetoresistance perovskite charge order double exchange

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石兆辉,冯静,孟健,张密林.Mn位掺杂钙钛矿结构化合物LaSr₂Mn_2-xNi_xO₇的磁性和电性的研究[J].无机化学学报,2006,22(8):1530-1534.

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