Gd_2Ba_4CuNbO_y掺杂对单畴GdBCO超导块材性能的影响  

The effect of Gd_2Ba_4CuNbO_y doping on the properties of single domain GdBCO bulk superconductors

作　　者：梁伟[1] 杨万民[1] 程晓芳[1] 李国政[1] 高平[1] 万凤[1] 宋芳[1] 

机构地区：[1]陕西师范大学物理学与信息技术学院,陕西710062

出　　处：《中国科学：物理学、力学、天文学》2011年第2期201-206,共6页Scientia Sinica Physica,Mechanica & Astronomica

基　　金：国家自然科学基金(批准号:50872079);国家高技术研究发展计划(编号:2007AA03Z241);中央高校基本科研业务费专项资金(编号:GK200901017)资助项目

摘　　要：本文采用顶部籽晶熔融织构方法(TSMTG),制备出了配比为GdBa2Cu3O7-δ(Gd123):Gd2BaCuO5(Gd211):Gd2Ba4CuNbOy(GdNb2411)=1:(0.4-x):x的系列单畴GdBCO超导块材(其中x=0,0.02,0.04,0.06,0.08,0.1,0.12,0.14,0.16),并研究了不同GdNb2411掺杂量对样品生长形貌和磁悬浮力的影响.结果表明:在该掺杂范围内,均有可能制备出单畴GdBCO超导块材,且样品的表面生长形貌与掺杂量x密切相关.当x≤0.06mol时,样品上表面光滑平整且四径分明,表现出通常的单畴形貌;当x≥0.08mol时,样品的单畴区域不再光滑和平整,表面出现褶皱,且随着掺杂量的增加,单畴区域越来越小.样品的磁悬浮力测试结果表明:随着掺杂量的增加,其磁悬浮力先增大后减小,当x=0.06mol时,样品的磁悬浮力达到最大25N.实验结果对研究纳米粒子的磁通钉扎作用及进一步提高GdBCO超导块材的性能有重要意义.Single domain GdBCO bulk superconductors,with compositions of GdBa2Cu3O7-δ（Gd123）：Gd2BaCuO5 （Gd211）：Gd2Ba4CuNbOy （GdNb2411） =1：（0.4-x）：x,（x=0,0.02,0.04,0.06,0.08,0.1,0.12,0.14,0.16）,have been successfully fabricated by the top-seeding melt texture growth process （TSMTG）. The effect of the different doping amounts of GdNb2411 on the growth morphology and the magnetic levitation force properties of single domain GdBCO bulk superconductors has been investigated. The results show that single domain GdBCO bulk samples can be fabricated within the scope of the doping,and the surface morphologies of the samples are closely related to the doping content x. It is of a smooth faced plane and four clear radius for the samples with x≤0.06 mol,but it is of a wrinkle surface for the samples with x≥0.08mol and the single domain area is observed to reduce with the increasing of x. The test results of the magnetic levitation force of the samples show that the levitation force of samples increases first and then decreases with the increasing of x,the largest levitation force of 25 N is obtained in the samples with x=0.06 mol. The results is very important for study in flux pinning of nanoparticles and further improvement in the properties of GdBCO bulk superconductors.

关 键 词：单畴GdBCO超导块材 顶部籽晶熔融织构法 Gd2Ba4CuNbOy掺杂 磁悬浮力 

分 类 号：O511[理学—低温物理]