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Zeitschrift für Physik B Condensed Matter

, Volume 54, Issue 2, pp 121–128 | Cite as

Spin-polarized photoemission study on the temperature dependence of the exchange splitting of Ni

  • R. Raue
  • H. Hopster
  • R. Clauberg
Article

Abstract

Using spin-polarized photoemission with high energy- and angle resolution (ΔE=100 meV, ΔΘ=±3°) we have investigated the temperature dependence of the exchange splitting of Ni in the temperature range 0.5≦T/Tc≦0.94. At room temperature we findΔex=0.18 eV for the exchange splitting of theS4 band at theX point of the Brillouin zone. With increasing temperature the total (spin-averaged) energy distribution shows a narrowing and merges into one peak. The spin-resolved energy distribution curves approach each other and are strongly broadened. A discussion of the data within current theories of itinerant electron magnetism is given. The spectra indicate that neither the pure Stoner model nor the prediction of local band theory, assuming a temperature independent exchange splitting are justified for Ni. We conclude that the exchange splitting decreases with increasing temperature and that transverse as well as longitudinal spin fluctuations are responsible for the broadening of the spin-resoived energy distribution curves.

Keywords

Neural Network Nonlinear Dynamics Energy Distribution Brillouin Zone Current Theory 
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-Verlag 1984

Authors and Affiliations

  • R. Raue
    • 1
  • H. Hopster
    • 1
  • R. Clauberg
    • 2
  1. 1.II. Physikalisches InstitutUniversität KölnKöln 41Federal Republic of Germany
  2. 2.Institut für FestkörperforschungKernforschungsanlage JülichJülich 1Federal Republic of Germany

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