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Intermediate Valence Spectroscopy

  • O. Gunnarsson
  • K. Schönhammer
Part of the NATO ASI Series book series (NSSB, volume 151)

Abstract

Spectroscopic properties of intermediate valence compounds are studied using the Anderson model. Due to the large orbital and spin degeneracy Nf of the 4f-level, 1/Nf can be treated as a small parameter. This approach provides exact T = 0 results for the Anderson impurity model in the limit Nf→∞, and by adding 1/Nf corrections some properties can be calculated accurately even for Nf=1 or 2. In particular valence photoemission and resonance photoemission spectroscopies are studied. A comparison of theoretical and experimental spectra provides an estimate of the parameters in the model. Core level photoemission spectra provide estimates of the coupling between the f-level and the conduction states and of the f-level occupancy. With these parameters the model gives a fair description of other electron spectroscopies. For typical parameters the model predicts two structures in the f-spectrum, namely one structure at the f-level and one at the Fermi energy. The resonance photoemission calculation gives a photon energy dependence for these two peaks in fair agreement with experiment. The peak at the Fermi energy is partly due to a narrow Kondo resonance, resulting from manybody effects and the presence of a continuous, partly filled conduction band. This resonance is related to a large density of low-lying excitations, which explains the large susceptibility and specific heat observed for these systems at low temperatures.

Keywords

Conduction State Core Hole Anderson Impurity Model Coulomb Matrix Element Folding Technique 
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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Copyright information

© Springer Science+Business Media New York 1987

Authors and Affiliations

  • O. Gunnarsson
    • 1
  • K. Schönhammer
    • 2
  1. 1.Max-Planck Institut für FestkörperforschungStuttgart 80W. Germany
  2. 2.Institut für Theoretische PhysikUniversität GöttingenGöttingenW. Germany

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