Springer Nature is making SARS-CoV-2 and COVID-19 research free. View research | View latest news | Sign up for updates

Photoemission on highT c superconductors

  • 40 Accesses

  • 42 Citations


XPS and UPS photoemission results on the new high-T c oxide superconductors La2−xMexCuO4 (Me=Sr, Ba) with a maximumT c≈40 K show the following: 1) the electronic density of states atE F is small (smaller than in pure Cu); the work function is metallic like with a value around 4.2 eV. 2) The Cu-2p spectra show hardly a possible small tendency to a mixed valent Cu3+/Cu2+state with increasing Me content, but smaller than expected from the Me2+ concentration suggesting that oxygen defects are responsible for the charge compensation. 3) The core level spectra of La, Me, and O show satellites which are at least partially related to O2− defects and which change in intensity with increasing surface sensitivity of the experiments. First core-level spectra on y1.2Ba0.8CuO4 with aT c ≈ K indicate a complicated composition of these new compounds.

This is a preview of subscription content, log in to check access.


  1. 1.

    J.G. Bednorz, K.A. Müller: Z. Physik B64, 189 (1986)

  2. 2.

    J.B. Bednorz, M. Takashige, K.A. Müller: Europhys. Lett.3, 379 (1987)

  3. 3.

    C.W. Chu, P.H. Hor, R.L. Meng, L. Gao, Z.J. Huang, Y.Q. Wang: Phys. Rev. Lett.58, 405 (1987)

  4. 4.

    R.J. Cava, R.B. van Dover, B. Bartlogg, E.A. Rietman: Phys. Rev. Lett.58, 408 (1987)

  5. 5.

    C. Politis, J. Geerk, M. Dietrich, B. Obst: Z. Physik B66, 141 (1987)

  6. 6.

    J.H. Jorgensen, H.B. Schüttler, D.G. Hinks, D.W. Capone, I.K. Zhang, M.B. Brosky, D.J. Scalapino: Phys. Rev. Lett.58, 1024 (1987)

  7. 7.

    M.K. Wu, Y.R. Ashburn, C.J. Torng, P.H. Hor, R.L. Meng, L. Gao, Z.J. Huang, Y.Q. Wang, C.W. Chu: Phys. Rev. Lett.58, 908 (1987)

  8. 8.

    P.H. Hör, L. Gao, R.L. Meng, Z.J. Huang, Y.Q. Wang, K. Forster, J. Vassilious, C.W. Chu, M.K. Wu, J.R. Ashburn, C.J. Torng: Phys. Rev. Lett.58, 911 (1987)

  9. 9.

    P. Steiner, J. Albers, V. Kinsinger, I. Sander, S. Hüfner, C. Politis: Z. Physik B67, 19 (1987)

  10. 10.

    L.F. Mattheis: Phys. Rev. Lett.58, 1028 (1987)

  11. 11.

    J. Yu, A.J. Freeman, J.H. Xu: Phys. Rev. Lett.58, 1035 (1987)

  12. 12.

    B. Viswanathan, S. Madhavan, C.S. Swamy: Phys. Stat. Solidi B33, 629 (1986)

  13. 13.

    J.L.G. Fierro, L. Gonzales Tejuca: Appl. Surf. Sci.27, 453 (1987)

  14. 14.

    B. Cord, R. Courths: Surf. Sci.152/153, 1141 (1985)

  15. 15.

    B. Cord, R. Courths: Surf. Sci.162, 34 (1985)

  16. 16.

    C. Politis: Private communication

Download references

Author information

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Steiner, P., Courths, R., Kinsinger, V. et al. Photoemission on highT c superconductors. Appl. Phys. A 44, 75–79 (1987). https://doi.org/10.1007/BF00617893

Download citation


  • 74.00
  • 74.10
  • 74.70
  • 79.60