摘要
对Nd0 5Sr0 4Pb0 1 Mn1 -xFexO3系列多晶样品的结构 ,磁和转变特性进行了实验研究 .在x =0 0 0— 0 10的范围内获得了单相样品 ,Fe3+ 的替代并没有引起整个系列的结构变化 ,然而Mn位的掺杂却强烈地抑制了Nd0 5Sr0 4Pb0 1MnO3的铁磁性和金属—绝缘体转变 .在低掺杂情况下 (x≤ 0 0 6)Mn被Fe替代 ,金属—绝缘体转变温度TP 平均下降了 19K ,当x≥ 0 0 8铁磁金属态完全过渡为绝缘态 .这主要归因于Fe3+ 的渗入影响了化合物eg
Structure, magnetic and transport properties of polycrystalline Nd0.5Sr0.4Pb0.1Mn1-xFe2O3 Compounds were experimentally studies. Single-phase samples were obtained in the range x = 0.0-0.1 of Fe Content. There are, no appreciable structure changes for the introduction of Fe. Mn-site doping favous a reduction of magnetic/resistive transport, at a rate of similar to16K for 6% Fe, and an elevated resistivity. Metal-insulator transition disappears when the content of Fe exceeds similar to0.08. The enhanced doping effects in Nd0.5Sr0.4Pb0.1Mn1-xFexO3 can be ascribed to the presence of Fe, which influences the concentration of mobile electron e(g) and restrain the double exchange interaction in the compounds.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2003年第6期1520-1523,共4页
Acta Physica Sinica
基金
中国科学院百人计划资助的课题~~
