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YBa2(Cu0.95M0.05)3O7-δ的代换效应及其中子衍射研究

杨应昌 查元勃 袁惟淳 杨继廉 张百生 周蕙明 丁永凡 金兰 叶春堂

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YBa2(Cu0.95M0.05)3O7-δ的代换效应及其中子衍射研究

杨应昌, 查元勃, 袁惟淳, 杨继廉, 张百生, 周蕙明, 丁永凡, 金兰, 叶春堂

SUBSTITUTION EFFECTS AND NEUTRON DIFFRACTION STUDY OF YBa2(Cu0.95M0.05)3O7-δ

YANG YING-CHANG, ZHA YUAN-BO, YUAN WEI-CHUN, YANG JI-LIAN, ZHANG BAI-SHENG, ZHOU HUI-MING, DING YONG-FAN, JIN LAN, YE CHUN-TANG
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  • X射线衍射实验表明YBa2(Cu0.95M0.05)3O7-δ(M=Ti,V,Cr,Mn,Fe,Co,Ni,Cu和Zn)均为单相结构。Fe,Co,Ni和Zn对Cu的替代使超导临界温度Tc显著下降,而同样含量的Ti,V,Cr,Mn对Cu的替代并未对超导性能产生显著影响。并利用中子衍射分析了Ti,Mn,Fe和Co对Cu原子的取代,发现代换原子对Cu的两个晶位各自存在不同的择优占据
    YBa2(Cu0.95M0.05)3O7-δ were identified as single phase with M = Ti, V, Cr, Mn, Fe, Co, N1, Cu and Zn. Substitution of Fe, Co, Ni and Zn for Cu makes Tc, decrease significantly, while at the same content, no distructuve effect on Tc was observed in the replacement of Cu with Ti, V, Cr and Mn. The site occupation of Ti, Mn, Fe and Co ions has been investigated by using neutron diffraction technique, and strong site preference for these ions were observed. Based on these results, the two diffrent Cu sites and their relationship to the superconductivity in YBa2Cu3O7-δ are discussed. The substitution effect for copper on magnetic properties in YBa2(Cu0.95M0.05)3O7-δ and the correlation between magnetic and superconduc-tiviting properties are reported.
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出版历程
  • 收稿日期:  1989-03-27
  • 刊出日期:  2005-03-20

YBa2(Cu0.95M0.05)3O7-δ的代换效应及其中子衍射研究

  • 1. (1)北京大学物理系,北京,100871; (2)中国原子能科学研究院,北东,102413

摘要: X射线衍射实验表明YBa2(Cu0.95M0.05)3O7-δ(M=Ti,V,Cr,Mn,Fe,Co,Ni,Cu和Zn)均为单相结构。Fe,Co,Ni和Zn对Cu的替代使超导临界温度Tc显著下降,而同样含量的Ti,V,Cr,Mn对Cu的替代并未对超导性能产生显著影响。并利用中子衍射分析了Ti,Mn,Fe和Co对Cu原子的取代,发现代换原子对Cu的两个晶位各自存在不同的择优占据

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