Y_(0.5)Gd_(0.5)Ba_2Cu_3O_(7-δ)体系中通氧时间对超导转变温度的影响  

Effect of Gd-doping on superconding critical temperature of YBCO bulk

作　　者：黄参[1] 汪海英[1] 

机构地区：[1]上海大学物理系,上海200436

出　　处：《低温与超导》2006年第3期179-182,193,共5页Cryogenics and Superconductivity

基　　金：高等学校博士学科点专项科研基金(20040280007);上海市自然科学基金(05ZR14051);上海市重点学科建设项目(T0104)基金资助

摘　　要：研究了高温氧化物超导体Y0.5Gd0.5Ba2Cu3O7-δ体系中通氧时间对超导转变温度及超导转变温区的影响。Y0.5Gd0.5Ba2Cu3O7-δ样品是按相等摩尔数的Gd与Y元素配比,采用传统的固相反应法烧结而成的多晶块材。实验结果显示:Y0.5Gd0.5Ba2Cu3O7-δ烧结样品与YBa2Cu3O7-δ烧结样品均具有很好的单相性,在一定的通氧条件下其超导临界转变温度TC与超导初始转变温度TCO值相对YBa2Cu3O7-δ烧结样品有提高。文中对此结果进行了讨论。We reported the experimental resuhs about the superconducting critical temperature Tc and initial transit temperature Tco of Y0.5Gd0.5Ba2Cu3O7-δ sintered bulk affected by oxygen content. The sample of Y0.5Gd0.5Ba2Cu3O7-δ were prepared by standard solid state reaction methods with half part of Y3^＋ in YBa2Cu3O7-δ were substituted by Gd^3＋ formed a new structure. The experimental results shows that, compared with YBa2Cu3O7-δ, there is a good improvement in the Tc of the Y0.5 Gd0.5 Ba2 Cu3 O7-δ sample which were annealed under oxygen flow at 500 ℃ more than 30 hours, but not in the ones which were annealed under oxygen flow at 500 ℃ for less than 30 hours.

关 键 词：高温氧化物超导体 GD掺杂 超导转变温度 

分 类 号：O511[理学—低温物理] TS262.2[理学—物理]