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Photoemission in YbCu2Si2: problems with the Kondo impurity model

  • Author(s): Lawrence, JM;
  • Arko, AJ;
  • Joyce, JJ;
  • Canfield, PC;
  • Fisk, Z;
  • Thompson, JD;
  • Bartlett, RJ
  • et al.
Abstract

We report valence band photoemission results for YbCu2Si2, The 4f13(J = 7 2) final state peak, centered 60 meV below the Fermi level ε{lunate}F, lacks the temperature dependence and is broader than predicted for a Kondo resonance. Together with recent photoemission results for cerium compounds, these results raise serious doubts about the Kondo impurity explanation of heavy fermion photoemission. © 1992.

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