LaBa_2Cu_(3-x)Zn_xO_y体系的结构和输运性质研究  

STUDY OF STRUCTURE AND TRANSPORT PROPERTIES OF LaBa_2Cu_(3-x)Zn_xO_y

作　　者：浦其荣[1,2] 陶汝华[1,2] 许高杰[1,2] 王关生[1,2] 张建武[1,2] 丁泽军[1,2] 孙霞[1,2] 

机构地区：[1]中国科学院中国科学技术大学结构分析重点实验室,合肥230026 [2]中国科学技术大学天文与应用物理系,合肥230026

出　　处：《低温物理学报》2005年第A01期530-534,共5页Low Temperature Physical Letters

基　　金：国家自然科学基金(No.60306006)资助项目~~

摘　　要：我们用固相反应法合成了LaBa2Cu3-xZnxOy(0≤x≤1.0)系列样品.X-光衍射分析显示,在整个掺杂区内皆为正交结构,晶格常数a,b和c随掺杂量的增加略有增大.Zn含量的增加使体系正常态的电阻率上升.红外光谱(IR)表明:对于不掺杂的样品,在531cm-1和583cm-1附近有两个显著的吸收峰,随掺杂量x的增加前者基本不移动,后者则向高频移动,强度略有减小.电子顺磁共振实验(EPR)揭示了Zn掺杂对Cu2+的自旋关联行为的影响.本文讨论了掺杂对结构、输运性质和自旋关联的影响.Series of samples of LaBa2Cu3-xZnxOy（0≤x≤1.0） system were prepared by solid state reaction method. X-ray diffraction indicated that all the samples are single phase with orthorhombic structure. The lattice parameters α,b and c increase rarely as x increasing, while resistivity in normal-state increases. Two infrared （IR） peaks around 531cm^-1 and 583cm^-1 are clearly observed in the IR spectra. The 583cm^-1 vibration increases and its intensity decreases. mode shifts up to high frequency as x The frequency and intensity of the 531cm^-1 vibration mode almost unchanged. The effect on spin correlation of Cu^2＋ with Zn doping was indicated through Electron Paramagnetic Resonance experiment. The effect of Zn doping on structure, transport properties and spin correlation is discussed in the text.

关 键 词：Zn掺杂 结构 输运性质 

分 类 号：O511[理学—低温物理]