锶镁掺杂钡位对Y-123超导性能和晶体结构的影响比较  

THE IMPACT OF THE SUBSTITUTION OF Sr AND Mg FOR Ba LOCATION IN Y-123 ON SUPERCONDUCTIVITY AND CRYSTAL STRUCTURE

作　　者：薛运才[1] 陈镇平[1] 薛人中[1] 李涛[1] 刘德伟[1] 

机构地区：[1]郑州轻工业学院技术物理系,郑州450002

出　　处：《低温物理学报》2008年第1期79-82,共4页Low Temperature Physical Letters

基　　金：河南省自然科学基金资助项目(No.0411023100);河南省教育厅自然科学基础研究计划项目(No.2004210087);河南省高校青年骨干教师资助计划项目(No.104)~~

摘　　要：采用四引线法对掺杂样品YBa2-xMgxCu3O7-δ和YBa2-xSrxCu3O7-δ（x=0.0～0.2）的超导电性能进行了系统测量，发现随着镁和锶掺杂量的增加，样品的超导转变温度总体呈明显降低趋势。同时利用XRD对系列样品YBa2-xMgxCu3O7-δ。和YBa2-xSrxCu3O7-δ的晶体结构进行研究，发现随着掺杂量的增加，样品的晶体结构由正交相向四方相转变。初步分析了钡位镁和锶掺杂所引起的晶体结构变化对超导电性的影响，该研究结果为高温超导机理的进一步研究提供了实验资料。First, superconductivity of the YBa2-xMgxCu3O7-δ and YBa2-xSrxCu3O7-δ（x=0.0～0.2）is measured. The result indicates that superconductivity transition temperature has a tendency of obvious dropping with the increase of Mg and Sr substituting quantity. Second, XRD is used to study the crystal structure of sample , and with the increase of substituting quantity, the structure of the sample changes from the orthogonal phase to tetragonal phase gradually. It is analyzed that the changing of the crystal structure caused by the substitution of Mg and Sr for Ba location has impact on superconductivity. The study result provides the experiment material for the further of high temperature superconductivity.

关 键 词：超导电性 晶体结构 超导转变温度 

分 类 号：O511[理学—低温物理]