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Chin. Phys. B, 2008, Vol. 17(9): 3484-3489    DOI: 10.1088/1674-1056/17/9/057
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

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.
Keywords:  YBCO      simulated calculations      positron annihilation      cluster effect  
Received:  28 January 2008      Revised:  20 March 2008      Accepted manuscript online: 
PACS:  78.70.Bj (Positron annihilation)  
  71.15.Nc (Total energy and cohesive energy calculations)  
  74.62.Dh (Effects of crystal defects, doping and substitution)  
  74.72.Bk  
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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