Acta Phys. -Chim. Sin. ›› 1992, Vol. 8 ›› Issue (04): 445-451.doi: 10.3866/PKU.WHXB19920405

• ARTICLE • Previous Articles     Next Articles

Energy Band Structures of Duble Tl-O Layer Tl-Ba-Ca-Cu Oxide Superconductors

Cao Yang; Liu Jian   

  1. Department of Chemistry, Suzhou University, Suzhou 215006; Department of Chemistry, Suzhou Railway Teachers College, Suzhou 215009
  • Received:1991-03-13 Revised:1991-08-10 Published:1992-08-15
  • Contact: Cao Yang

Abstract: We calculated the energy band structures of the double TI-O layer TI-Ba-Ca-CuO oxide superconductors by performing the tight-binding band structure calculation method on the basis of EHT approximation. The results show that the Fermi surfaces are closed on the a~*b~* plane. The increase of electronic state densities on the Fermi level is consistent with the raise of T_c in this system. The regular changing of the net charges of Cu and O indicates that the ionic states of Cu and O in Cu-O plane may influence the superconductivity of this system.

Key words: Band structure, Tl-Ba-Ca-Cu-O, Superconductor