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)
Key Laboratory of Material Physics of Educational Ministry, Zhengzhou University, Zhengzhou 450052, China
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.
Received: 28 January 2008
Revised: 20 March 2008
Accepted manuscript online:
Fund: Project supported by the National
Natural Science Foundation of China (Grant No 10647145) and The
Basic Science Foundation of Henan Educational Bureau of China.
Cite this article:
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) Superconductivity without dependence on valenceelectron density in Zn doped YBCO systems 2008 Chin. Phys. B 17 3484
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