La_(4/3)Ca_(5/3)Mn_2O_7的结构、电输运及磁性质研究  

STUDY OF STRUCTURE, ELECTICAL AND MAGNETIC PROPERTIES OF La_(4/3)Ca_(5/3)Mn_2O_7

作　　者：刘莉[1] 王永强[1] 田召明[1] 李派[1] 汪川惠[1] 尹诗岩[1] 

机构地区：[1]华中科技大学物理系,武汉430074

出　　处：《低温物理学报》2007年第2期90-93,共4页Low Temperature Physical Letters

基　　金：国家自然科学基金(项目编号:10574049)资助的课题~~

摘　　要：采用溶胶-凝胶法,在不同温度烧结制备了名义组分为La4/3Ca5/3Mn2O7的多晶样品.X射线结构分析以及电、磁输运性质的测量表明:La4/3Ca5/3Mn2O7形成的是La2/3Ca1/3MnO3和CaO的混合物.Polycrystalline La4/3Ca5/3 Mn2O7 samples were prepared by a sol-gel method and followed by sintering at different temperatures. X-ray diffraction （XRD） was used to analyze the structure and the temperature dependence of electrical resistivity and magnetization were measured to observe the transport properties. Based on the measurement results, we point out that La4/3Ca5/3 Mn2O7 is composed of La2/3Ca1/3MnO3 and CaO.

关 键 词：超大磁电阻 X射线衍射 绝缘体-金属转变 

分 类 号：O482.5[理学—固体物理]