钙钛矿锰氧化物(La1-xGdx)0.5Sr0.5MnO3的电磁特性

稀土, 2010, 31(5): 24-27. doi: 10.3969/j.issn.1004-0277.2010.05.005

钙钛矿锰氧化物(La1-xGdx)0.5Sr0.5MnO3的电磁特性

周敏 ^1, , 郑琳 ^2, , 赵建军 ^3, , 吴鸿业 ^4, , 鲁毅 ^5,

1.内蒙古科技大学,数理与生物工程学院,内蒙古,包头,014010

2.包头师范学院,物理系,内蒙古,包头,014030

3.包头师范学院,物理系,内蒙古,包头,014030

4.包头师范学院,物理系,内蒙古,包头,014030

5.包头师范学院,物理系,内蒙古,包头,014030

基金项目: 内蒙古自治区科学基金(2009MS0101) 国家自然科学基金(50862007)

关键词：锰氧化物 , 电性 , 磁性

Electronic and Magnetic Properties of Perovskite Manganities (La1-xGdx)0.5Sr0.5MnO3

通过磁化强度和电阻的测量对多晶样品(La1-xGdx)0.5,Sr0.5MnO3(x=0,0.1,0.2,0.3,0.4)的电磁特性进行了系统的实验研究.当x≤0.2时,样品显示出铁磁金属态(FMM)到顺磁绝缘态(PMI)的转变;当0.3≤x≤0.4时,金属-绝缘体转变温度Tp消失,样品显示出反铁磁绝缘态(AFMI)到顺磁绝缘态(PMI)的转变.同时随着x的增加所有样品的居里温度Tc和金属-绝缘体转变温度Tμ降低,并且在居里温度附近观测到了磁电阻效应.

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钙钛矿锰氧化物(La1-xGdx)0.5Sr0.5MnO3的电磁特性

Electronic and Magnetic Properties of Perovskite Manganities (La1-xGdx)0.5Sr0.5MnO3

参考文献