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Published on: June 28, 2018
Local electron-electron interaction strength in ferromagnetic nickel determined by spin-polarized positron
Hubert Ceeh1, Josef Andreas Weber, Josef Andreass Weber1
1Technische Universität München, Lehrstuhl E21, James-Franck Straße, 85748 Garching, Germany.
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.
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