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
Altmetric calculates a score based on the online attention an article receives. Each coloured thread in the circle represents a different type of online attention. The number in the centre is the Altmetric score. Social media and mainstream news media are the main sources that calculate the score. Reference managers such as Mendeley are also tracked but do not contribute to the score. Older articles often score higher because they have had more time to get noticed. To account for this, Altmetric has included the context data for other articles of a similar age.