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XANES Study of Copper Valence and Structure in High Tc Superconducting Oxides

  • K. B. Garg
  • K. V. R. Rao
  • N. L. Saini
  • D. C. Jain
  • H. S. Chauhan
  • U. Chandra
  • J. Singh
Conference paper

Abstract

The question of Cu3+ and role it may play in the mechanism of the HTSC in the perovskites recently has been examined in depth employing XPS and XANES techniques [1–5]. The Cu 2p XPS and valence band emission from CuO and YBa2 Cu3O7-x when discussed along with the CuL3, XANES in these clearly ruled out the presence of Cu3+ and established that the holes are instead situated in the oxygen band. This is further reinforced by the presence of additional peak in the O ls XPS emission. Measurements and one-electron full-multiple scattering calculations on the CuK XANES establish that the best fits to experimental data are obtained employing the 3d10 configuration for copper [6]. The question of alternative structure proposed by Reller, Bednorz and Muller is also examined and rejected through these calculations.

Keywords

XANES Spectrum Oxygen Band Characteristic Spectral Feature Fourth Shell Final State Configuration 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    A. Bianconi, A. Congiu Castellano, M. De Santis, C. Politis, A. Marcelli, S. Mobilio, A. Savoia, Z. Physik B Condensed Matter 67, 307 (1987).ADSCrossRefGoogle Scholar
  2. 2.
    A. Bianconi, A. Congiu Castellano, M. De Santis, P. Rudolf, P. Lagarde and A.M. Flank, Solid State Commun. 63,1009 (1987).ADSCrossRefGoogle Scholar
  3. 3.
    A. Bianconi, A. Congiu Castellano, M. De Santis, P. Delogu, A. Gargano, R. Giorgi, Solid State Commun. 63,1135 (1987).ADSCrossRefGoogle Scholar
  4. 4.
    A. Bianconi, A. Clozza, A. Congiu, Castellano, S. Delia Longa, M. De Santis, A. Di Cicco, K. Garg, P. Delogu, A. Gargano, R. Giorgi, P. Lagarde, A.M. Flank and A. Marcelli, Int. J. Modern Phys. B. 1,853 (1987).ADSCrossRefGoogle Scholar
  5. 5.
    A. Bianconi, A. Clozza, A. Congiu Castellano, S. Delia Longa, M. De Santis, A. Di Cicco, K.B. Garg, P. Delogu, A. Gargano, R. Giorgi, P. Lagarde, A.M. Flank and A. Marcelli, Proc. 14th Int. Conf. on X-ray and Inner-shell Processes, Paris Sept. 14–18, 1987 (France).Google Scholar
  6. 6.
    K.B. Garg, A. Bianconi, S. Delia Longa, A. Clozza, M. De Santis and A. Marcelli, Phys. Rev. B 38, 244 (1988).ADSCrossRefGoogle Scholar
  7. 7.
    A.S. Koster, Molecular Physics 26, 625 (1973)ADSCrossRefGoogle Scholar
  8. 8.
    J.J. Capponi, C. Chaillout, A.W. Hewat, P. Lejay, M. Marezio, N. Nguyen, B Raveau, J.L. Soubeyroux, J.L. Tholence, and R. Tournier Europhysics Lett. 3, 1301 (1987)ADSCrossRefGoogle Scholar
  9. 8.
    A.W. Hewat, J.J. Capponi, C. Chaillout, M. Marezio and E.A. Hewat, Sol. State Commun. 64, 301 (1987).ADSCrossRefGoogle Scholar
  10. 9.
    A. Reller, J.G. Bednorz , K.A. Muller, Z. Physik B. Condensed Matter 67, 285 (1987).ADSCrossRefGoogle Scholar
  11. 10.
    P.J. Durham, W.M. Temmerman, and G.M. Stocks, Proceeding of the 14th International Conference on X-ray and Inner-shell Processes, Paris Sept. 14–18, 1987 (France).Google Scholar
  12. 11.
    H. Oyanagi, H. Ihara, T. Matsubara, T. Matsushita, T. Tokumoto, M. Hirabayashi, N. Terada, K. Senzaki, Y. Kimura and T. Yao, Jpn. J. Appl. Phys. 26, L488 (1987).ADSCrossRefGoogle Scholar
  13. 12.
    E.E. Alp, G.K. Shenoy, D.G. Hinks, D.W. Capone II, L. Soderholm and M. Ramanathan, Phys. Rev. B35, 7199 (1987).ADSGoogle Scholar

Copyright information

© Springer Japan 1989

Authors and Affiliations

  • K. B. Garg
    • 1
  • K. V. R. Rao
    • 1
  • N. L. Saini
    • 1
  • D. C. Jain
    • 1
  • H. S. Chauhan
    • 1
  • U. Chandra
    • 1
  • J. Singh
    • 1
  1. 1.Department of PhysicsUniversity of RajasthanJaipurIndia

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