中国物理B ›› 2008, Vol. 17 ›› Issue (9): 3484-3489.doi: 10.1088/1674-1056/17/9/057

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Superconductivity without dependence on valenceelectron density in Zn doped YBCO systems

李平林, 王永永, 田永涛, 汪静, 牛晓丽, 王俊喜, 王单丹, 王晓霞   

  1. Key Laboratory of Material Physics of Educational Ministry, Zhengzhou University, Zhengzhou 450052, China
  • 收稿日期:2008-01-28 修回日期:2008-03-20 出版日期:2008-09-08 发布日期:2008-09-08
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 10647145) and The Basic Science Foundation of Henan Educational Bureau of China.

Superconductivity without dependence on valenceelectron density in Zn doped YBCO systems

Li Ping-Lin(李平林)†, Wang Yong-Yong(王永永), Tian Yong-Tao(田永涛), Wang Jing(汪静), Niu Xiao-Li(牛晓丽), Wang Jun-Xi(王俊喜), Wang Dan-Dan(王单丹), and Wang Xiao-Xia(王晓霞)   

  1. Key Laboratory of Material Physics of Educational Ministry, Zhengzhou University, Zhengzhou 450052, China
  • Received:2008-01-28 Revised:2008-03-20 Online:2008-09-08 Published:2008-09-08
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 10647145) and The Basic Science Foundation of Henan Educational Bureau of China.

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摘要： This paper reports that the YBa$_{2}$Cu$_{3 - x}$Zn$_{x}$O$_{7 - \delta }\ (x=0-0.4$) samples are researched by means of x-ray diffraction, calculations of binding energy, the positron experiments and variations of oxygen content. The results of simulated calculations, positron experiments and variations of oxygen content support the existence of cluster effect. Moreover, it is concluded that the cluster effect is an important factor on suppression of high-$T_{\rm c}$ cuprate superconductivity and the $T_{\rm c}$ does not depend on the density of valence electron directly.

Abstract: This paper reports that the YBa$_{2}$Cu$_{3 - x}$Zn$_{x}$O$_{7 - \delta }\ (x=0-0.4$) samples are researched by means of x-ray diffraction, calculations of binding energy, the positron experiments and variations of oxygen content. The results of simulated calculations, positron experiments and variations of oxygen content support the existence of cluster effect. Moreover, it is concluded that the cluster effect is an important factor on suppression of high-$T_{\rm c}$ cuprate superconductivity and the $T_{\rm c}$ does not depend on the density of valence electron directly.

Key words: YBCO, simulated calculations, positron annihilation, cluster effect

中图分类号:  (Positron annihilation)

  • 78.70.Bj
71.15.Nc (Total energy and cohesive energy calculations) 74.62.Dh (Effects of crystal defects, doping and substitution)