Y_(1-x)Gd_xBa_2Cu_3O_(6+y)超导单晶的生长与高压氧退火  

GROWTH OF SINGLE CRYSTAL Y_(1-x)Gd_xBa_2Cu_3O_(6+y)

作　　者：张长贵[1] 吉和林 金新[1] 嵇家本 徐小农[1] 沈剑沦 姚希贤[1] 孙志坚[2] 杨森祖[2] 

机构地区：[1]南京大学物理系固体微结构实验室,南京210008 [2]南京大学信息物理系,南京210008

出　　处：《低温物理学报》1993年第3期207-214,共8页Low Temperature Physical Letters

基　　金：国家超导联合研究开发中心的资助;国家教委博士点基金;南京大学现代分析中心的资助

摘　　要：利用自助熔生长方法制备YBa_2Cu_3O_(6+y),Y_(0.5)Gd_(0.5)Ba_2Cu_3O_(6+y),与GdBa_2Cu_3O_(6+y),超导单晶。经多次试验,选择它的最佳生长条件。将单晶样品置于高压(～150bar)纯氧中退火,结果使T_c达到90K,说明这种退火对增加T_c很有效。劳埃衍射图进一步证明,样品是高质量单晶。关于它的结构、成份分析与磁性亦作过报道。Single crystals YBa2Cu3O6+y, Y0.5Gd0.5Ba2Cu3O6+y and GdBa2Cu3O6+y have been prepared by self-flux method, and their growing conditions have been optimized through the trial of several runs. A post annealing of as-grown single crystals in high pressure (-150bar) pure oxygen proves to very effective in increasing their Tc to over 90K. Laue back diffraction patterns confirmed the good quality of the samples. The morphology, composition analysis and the magnetic properties of these crystals are also reported.

关 键 词：超导体 氧化物 单晶制备 退火 YBCO 

分 类 号：O511.1[理学—低温物理]