GdFeAsO_(1-x)F_x超导体的制备及其超导电性  

PREPARATION AND SUPERCONDUCTIVITY OF GdFeAsO_(1-x)F_x

作　　者：崔雅静[1] 陈永亮[1] 杨烨[1] 王雅真[1] 张勇[1] 赵勇[1] 

机构地区：[1]磁浮技术与磁浮列车教育部重点实验室,西南交通大学超导研究开发中心,成都610031

出　　处：《低温物理学报》2010年第1期1-5,共5页Low Temperature Physical Letters

基　　金：国家杰出青年基金(批准号:50588201);国家基础研究项目(973)(批准号:2007CB616906);国家教育部长江学者和创新团队发展计划(批准号:IRT0751);西南交通大学青年教师科研起步项目(批准号:2009Q009)资助的课题~~

摘　　要：通过先制备一种纳米尺寸的GdF3作为GdFeAsO1-xFx样品中F的反应原料,在相对较低的温度(1120℃)下成功制备出一系列GdFeAsO1-xFx(x=0,0.05,0.1,0.15,0.2,0.25)多晶样品.X射线衍射结果表明,超导样品属四方ZrCuSiAs-type结构,晶格参数随着掺F量的增加而减小.扫描电子显微镜测试结果表明,样品具有片层状晶体形貌特征.当掺F量x=0.1时,样品表现出超导电性,超导转变温度为22K,随着掺F量的增多,超导转变温度升高.和其他制备方法相比,这种制备方法更有利于F的掺入,而且可有效减少样品中杂质相的含量.Preparation of F-doped GdFeAsO1-xFx samples has been developed using GdF3 with nanometer scale as the source of fluorine. Polycrystalline samples of GdFeAsO1-xFx（x = 0, 0. 05, 0. 1, 0.15, 0. 2, 0. 25） have been successfully synthesized using the present method. According to the X-ray diffraction patterns, all of the samples possess a tetragonal ZrCuSiAs-type structure and the lattice parameters decreased with the increasing doping level. The layered crystal structure has been observed in the scanning electronic Microscope （SEM） images. Superconductivity emerges when x = 0. 1 with a transition temperature of 22K and it is definitely enhanced with the increasing F-doping level. Compared with other methods, this process is more effective to introduce F into GdFeAsO system as well as reduce the content of the impurities in the samples.

关 键 词：铁基超导体 ZrCuSiAs结构 

分 类 号：TM26[一般工业技术—材料科学与工程]