物理化学学报 >> 1990, Vol. 6 >> Issue (03): 259-262.doi: 10.3866/PKU.WHXB19900302

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掺杂对超导体(Tl1-x-yPbxMy)Sr2(Ca0.8Ln0.2)Cu2O7-δ(M=Sn4+或Sb5+, Ln=Y, La, Nd或Pr)性能的影响

张玉芬; 周鼎元; 郑香苗; 林炳雄; 唐有祺   

  1. 北京大学物理化学研究所应用物化教研室
  • 收稿日期:1989-12-30 修回日期:1990-02-12 发布日期:1990-06-15
  • 通讯作者: 张玉芬

Influence of Doping on Properties of Superconductor (Tl1-x-yPbxMy)Sr2(Ca0.8Ln0.2)Cu2O7-δ(M=Sn4+ or Sb5+, Ln=Y, La, Nd or Pr)

Zhang Yu-Fen; Zhou Ding-Yuan; Zheng Xiang-Miao; Lin Bing-Xiong; Tang You-Qi   

  1. Laboratory of Applied Physical Chemistry, Institute of Physical Chemistry, Peking University
  • Received:1989-12-30 Revised:1990-02-12 Published:1990-06-15
  • Contact: Zhang Yu-Fen

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Abstract: Subramanian et al. found superconductivity at 80 K in Tl_(0.5)Pb_(0.5)Sr_2CaCu_2O_y sample with YBa_2 Cu_3 O_(7-δ)-like structure. However, there is unstable factor in the structure of the superconductor. Total plus valence is 12.5, and total minus valence is 14. The structure was further stabilized by partial substitution of Y, La, Nd orPr for Ca and Sn~(4+) or Sb~(5+) for (Tl, Pb), so that T_c was achieved above 100 K. For example, T_c is about 103 K in a sample with nominal composition (Tl_(0.4) Pb_(0.5)Sn_(0.2))Sr_2(Ca_(0.8)Y_(0.2))Cu_2O_(7-δ). During the preparation of superconductors, the temperature of samples was very slowly down after sintering, or samples were annealed at 500—700 ℃. The samples absorbed the oxygen during cooling, but no phase change occured. Appropriate amount of the oxygen made T_e higher.