Superconductivity without dependence on valence electron density in (Al, Zn, Co) doped YBCO systems

作者：Zhang Yufeng^*; Wang Dandan; Li Pinglin

来源：Low Temperature Physics, 2010, 36(2): 162-166.

DOI：10.1063/1.3319358

• barium compounds
• high-temperature superconductors
• positron annihilation
• superconducting transition temperature
• X-ray diffraction
• yttrium compounds

We have used x-ray diffraction, oxygen content, positron annihilation technology, and simulation methods to investigate systematically the cuprates YBa2Cu3-x(Al,Zn,Co)(x)O7-delta (x=0-0.5). The experimental results and simulation calculations support the existence of a cluster effect. Moreover, it is concluded that the cluster effect is an important factor in the suppression of superconductivity and that T-c does not depend directly on the valence electron density in the samples.

• 出版日期2010-2
• 单位上海大学; 郑州大学