三层膜中特殊的磁电阻效应  

Special magnetoresistance effects in Trilayered Thin Films

作　　者：高洁[1,2] 汤业庆[1,2] 

机构地区：[1]新疆大学物理系 [2]中国科技大学结构分析开放实验室

出　　处：《新疆大学学报（自然科学版）》1998年第2期36-39,共4页Journal of Xinjiang University(Natural Science Edition)

摘　　要：本文研究了ＬＳＭＯ／ＰＣＭＯ／ＬＳＭＯ三层膜的输运性质和磁电阻电特性．随中间层Ｐｒ０．７Ｃａ０．３ＭｎＯ３＋δ厚度的增加，在零磁场下，三层膜的电阻率显著下降，在磁场为Ｈ＝０．７５Ｔ下，磁电阻效应在减少，转变温度向高温区移动，而且，热激活能在减少．中间层不仅诱发了内磁场，还诱发了ＬＳＭＯ的能隙中的态密度．The magnetoresistance effects(H=0.75T) and the transportation characteristice (H=0T) of La o.67 Sr 0.33 MnO 3+δ /Pr 0.7 Ca 0.3 MnO 3+δ /La o.67 Sr 0.33 MnO 3+δ trilayer filmsh have been studied.With the thickness of middle-layered changing,the resistivity of trilayer films shows greater decrease than the single layered La o.67 Sr 0.33 MnO 3+δ films,the MR values are decreased under 0.75T,and the thermal activation energy E c is decreased and disappeared at lower temperature.This imply that the middle-layered not only induces the intra-magnetic field but also induces the density of states between the LSMO's gap in the trilayered films.

关 键 词：巨磁电阻 钙钛矿氧化物 薄膜 

分 类 号：O484.43[理学—固体物理]