Bi掺杂对La0.67Ca0.33MnO3化合物磁性和导电特性的影响

功能材料, 2002, 33(2): 157-159.

Bi掺杂对La0.67Ca0.33MnO3化合物磁性和导电特性的影响

盛晓波 ^1, , 翟亚 ^2, , 林萍华 ^3, , 杨石强 ^4,

1.东南大学机械系,江苏,南京,210096南京大学物理系固体微结构开放实验室,江苏,南京,210093

2.东南大学物理系,江苏,南京,210096南京大学物理系固体微结构开放实验室,江苏,南京,210093

3.东南大学机械系,江苏,南京,210096南京大学物理系固体微结构开放实验室,江苏,南京,210093

4.东南大学机械系,江苏,南京,210096

基金项目: 南京大学校科研和教改项(M991405) 东南大学校科研和教改项目(9202001016)

关键词：钙钛矿 , 磁电阻 , 稀土

The effect of Bi doping on magnetic and conducting properties ofLa0.67 Ca0.33 MnO3 compound

与La的离子半径基本相同的Bi掺杂对钙钛矿锰氧化物La0.67Ca0.33MnO3的磁性和电输运性质有显著影响.掺杂使居里温度和磁化强度单调降低,电阻率和磁电阻随掺杂量增加先得到加强,然后又随着掺杂量的继续增加而降低.掺杂量达x=0.2时,试样在5～300K温度范围内表现为半导体特性,在ρ(T)及M(T)曲线上有两个以上相变,认为是铁磁相互作用与电荷有序转变竞争的结果.

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Bi掺杂对La0.67Ca0.33MnO3化合物磁性和导电特性的影响

The effect of Bi doping on magnetic and conducting properties ofLa0.67 Ca0.33 MnO3 compound

参考文献