Author:
Ceeh Hubert,Weber Josef Andreas,Böni Peter,Leitner Michael,Benea Diana,Chioncel Liviu,Ebert Hubert,Minár Jan,Vollhardt Dieter,Hugenschmidt Christoph
Abstract
Abstract
We employ a positron annihilation technique, the spin-polarized two-dimensional angular correlation of annihilation radiation (2D-ACAR), to measure the spin-difference spectra of ferromagnetic nickel. The experimental data are compared with the theoretical results obtained within a combination of the local spin density approximation (LSDA) and the many-body dynamical mean-field theory (DMFT). We find that the self-energy defining the electronic correlations in Ni leads to anisotropic contributions to the momentum distribution. By direct comparison of the theoretical and experimental results we determine the strength of the local electronic interaction U in ferromagnetic Ni as 2.0 ± 0.1 eV.
Publisher
Springer Science and Business Media LLC
Cited by
13 articles.
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