摘要
研究了La0 .7-xSmxSr0 .3MnO3(x =0 .0 0 ,0 .10 ,0 .2 0 ,0 .3 0 )体系的红外光谱 ,拉曼光谱 ,M T曲线 ,ESR曲线 ,ρ T曲线和MR T曲线。实验结果表明 :随着Sm掺入量的增加 ,体系从长程铁磁有序向自旋团簇玻璃态、反铁磁态转变 ,样品的居里温度下降 ,金属 绝缘体相变温度逐渐降低 ,对应的峰值电阻渐渐增大 ,磁电阻迅速增加 ,样品物理量发生的变化可以用晶格效应来解释。
The Infrared spectrum, Raman spectrum, M-T curves, ESR curves, ρ-T curves and MR-T curves of La 0.7-xSm xSr 0.3MnO 3 (x=0.00, 0.10, 0.20 and 0.30) were studied. The experimental results indicate that with increasing Sm doping, the system undergoes a transition from long range ferromagnetic order to the cluster-spin glass state and further to antiferromagnetic order, the Curie temperature decreases monotonously, the phase transition temperature of metal-isolator for the materials decreases monotonously, the corresponding peak resistance increases gradually and the magnetoresistance increases quickly. The effects of doping Sm can be explained by the lattice effect.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2004年第5期847-851,共5页
Chinese Journal of Rare Metals
基金
国家自然科学基金重点项目 ( 10 3 3 40 90 )
国家重点基础研究发展规划项目 ( 0 0 1CB610 60 4)
关键词
凝聚态物理
晶格效应
巨磁电阻效应
稀土
condenser physics
lattice effect
colossal magnetoresistance effect
rare earths
