摘要
研究了La位Dy掺杂对La0.7-xDyxSr0.3MnO3(0 00 x 0 70)电阻温度系数(TCR)的影响。实验结果表明:Dy掺杂将引起电阻率曲线的急剧变化,导致出现大的TCR;随Dy掺杂的增加,TCR在x=0.30出现峰值,然后随掺杂量的增加逐步降低。体系出现大的TCR,来源于Dy掺杂引起的晶格畸变和额外磁性耦合。
The effect of Dy doping in La_(0.7-x)Dy_xSr_(0.3)MnO (000x070) on the temperature coefficient of resistance (TCR) was investigated. Experimental results show that the Dy doping causes a steep change of resistance, resulting in large TCR. With the increase of Dy content, a TCR peak appears at x=030, and then the TCR decreases gradually with further increasing doping level. This large TCR should result from lattice distortions and extra magnetic coupling induced by Dy^(3+) ions.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2004年第6期760-764,共5页
Journal of the Chinese Society of Rare Earths
基金
国家自然科学基金重点项目(10334090)
国家重点基础研究发展规划项目(001CB610604)
关键词
凝聚态物理
电阻温度系数
额外磁性耦合
超大电阻变化
稀土
coherence physics
temperature coefficient of resistance (TCR)
extra magnetic coupling
colossal resistance change
rare earths
