English

应用科学学报 ›› 1993, Vol. 11 ›› Issue (4): 290-296.

• 论文 • 上一篇    下一篇

Bi-Sr-Ca-Cu-O超导体能带结构的研究

曹阳1, 刘坚2   

  1. 1. 苏州大学;
    2. 苏州铁道师范学院
  • 收稿日期:1991-08-26 修回日期:1992-01-10 出版日期:1993-12-31 发布日期:1993-12-31

ENERGY BAND STRUCTURE OF Bi-Sr-Ca-Cu-O SUPERCONDUCTORS

OAO YANG1, LIU JIAN2   

  1. 1. Suzhou University;
    2. Suzhou Railway Teachers College
  • Received:1991-08-26 Revised:1992-01-10 Online:1993-12-31 Published:1993-12-31

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摘要： 利用EHT近似下的紧束缚能带结构计算方法计算了Bi-Sr-Ca-Cu-O超导体的能带结构.计算结果表明费米面在a*b*面上是封闭的,费米能级上电子态密度的增加和体系转变温度Tc的提高是相一致的,Cu-O面上Cu和O的净电荷有规律的变化说明Cu-O面上Cu和O的离子价态可影响到该体系的超导电性.

关键词: 能带结构, Bi-Sr-Ca-Cu-O, 超导体

Abstract: The energy band structures of Bi-Sr-Ca-Cu-O superconductors were calculated by performing the tight-binding calculation method on the basis of EHT approximation. Results show that the Fermi surfaces are closed on the a*b* planes. The increase of electronic state densities on the Fermi level is consistent with the rise of Tc in this system. The regular changes of the net charges of Cu and O indicate that the ionio States of Cu and O in the Cu-O plane may influence the superconductivity of this system.

Key words: band structure, Bi-Sr-Ca-Cu-O, superconductor