摘要
研究了La0.7-xGdxSr0.3MnO3(x=0.00,0.10,0.15,0.20,0.30,0.40,0.50,0.60,0.70)体系的M T曲线、M H曲线、ESR曲线、ρ T曲线和MR T曲线。实验结果表明:随着Gd掺杂的增加,体系从长程铁磁有序向自旋团簇玻璃态和反铁磁状态转变,x=0.30和0.40时,样品在TC以上温区发生相分离;高掺杂时的输运行为在其磁背景下发生异常,Gd掺杂引起的磁结构的变化将导致CMR效应。
The M-T curves, M-H curves, ESR curves, ρ-T curves and MR-T curves of La_(0.7-x)Gd_xSr_(0.3)MnO_3 (x=0.00, 0.10, 0.15, 0.20, 0.30, 0.40, 0.50, 0.60 and 0.70) were studied. The experimental results indicate that with increasing Gd doping, the system undergoes a transition from long range ferromagnetic order to the cluster-spin glass state and further to antiferromagnetic order. For the samples x=0.30 and 0.40, the phase separation occurs at the temperature far above T_C. At high x value, the transport property exhibits abnormal behavior on the magnetic background, the variation in magnetic structure caused by Gd doping leads to colossal magnetoresistance.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2003年第5期512-517,共6页
Journal of the Chinese Society of Rare Earths
基金
国家自然科学基金重点项目(19934003)
高等学校博士学科点专项科研基金资助
关键词
凝聚态物理
相分离
超大磁阻效应
稀土
coherence physics
phase separation
colossal magnetoresistance effect
rare earths
