Electronic Properties and Spin-Correlations of CuO2-Planes in High Temperature Superconductors

  • P. Horsch
  • W. H. Stephan
Part of the NATO ASI Series book series (NSSB, volume 213)

Abstract

Considerable insight into the electronic structure and the nature of the charge carriers in high-T c superconductors (HTSC’s) comes from various types of photoemission and inverse photoemission experiments 1 . Such experiments showed that the states close to the Fermi level in the metallic samples have strong oxygen character 2 , i.e. additional holes go essentially on oxygen. By angle resolved photoemission in superconducting Bi 2 CaSr 2 Cu 2 O 8 even a band crossing the Fermi level could be resolved 3 . A Fermi edge has been seen by several groups, which suggests that there is a Fermi liquid which becomes superconducting. A further success of this class of spectroscopies was the observation of the superconducting gap by high-resolution UV-photoemission 4 . The discussion about the precise character of the carriers, however, is still on a qualitative level and controversial. Recent investigations of the O 1s absorption edge 5,6 showed that the relevant oxygen orbitals have 95% p x,y -symmetry, with x and y in the plane 6 .

Keywords

Coherence Kelly 

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Copyright information

© Plenum Press, New York 1989

Authors and Affiliations

  • P. Horsch
    • 1
  • W. H. Stephan
    • 1
  1. 1.Max-Planck-Institut für FestkörperforschungStuttgart 1Federal Republic of Germany

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