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Zeitschrift für Physik B Condensed Matter

, Volume 78, Issue 2, pp 241–253 | Cite as

Many body contributions to the electronic structure of nickel

  • W. Borgiel
  • W. Nolting
Article

Abstract

The full temperature-dependence of the electronic quasiparticle properties of ferromagnetic Ni is investigated by use of a theoretical model, which takes into account all intraatomic interactions in thed-band complex. After introduction of “effective” spin operators the model-Hamiltonian consists of a one-particle term, an intraband-interaction of Hubbardtype, and an interband-exchange as in thes-f (ord-f model. The one-particle energies are taken from a realistic bandstructure calculation in order to incorporate approximately all those interactions, which are not directly covered by our model. The model contains two parameters, the intraband couplingU and the interband exchangeJ. ChoosingU=6 eV,J=0.4 eV and applying a Green-function technique we get results in almost quantitative agreement with the experiment:Tc=635 K,m(T=0)=0.56 [ B , Curie-Weiss behaviour of the static susceptibility, satellite peak with temperature-dependent spinpolarization some 6 eV below the chemical potential μ, exchange splittings atT=0 of order 0.2–0.35 eV. The full temperature-dependencies of the electronic selfenergy, the one-particle spectral density, the quasiparticle density of states, and the quasiparticle bandstructure for two high symmetry directions are derived and discussed.

Keywords

Nickel Neural Network Nonlinear Dynamics Spectral Density Quantitative Agreement 
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 1990

Authors and Affiliations

  • W. Borgiel
    • 1
  • W. Nolting
    • 1
  1. 1.Fachbereich PhysikUniversität OsnabrückOsnabrückGermany

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