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Local electron-electron interaction strength in ferromagnetic nickel determined by spin-polarized positron annihilation

Citace:
CEEH, H., WEBER, J. A., BÖNI, P., LEITNER, M., BENEA, D., CHIONCEL, L., EBERT, H., MINÁR, J., VOLLHARDT, D., HUGENSCHMIDT, C. Local electron-electron interaction strength in ferromagnetic nickel determined by spin-polarized positron annihilation. SCIENTIFIC REPORTS, 2016, roč. 6, č. FEB 16 2016, s. 1-8. ISSN: 2045-2322
Druh: ČLÁNEK
Jazyk publikace: eng
Anglický název: Local electron-electron interaction strength in ferromagnetic nickel determined by spin-polarized positron annihilation
Rok vydání: 2016
Autoři: Hubert Ceeh , Josef Andreass Weber , Peter Böni , Michael Leitner , Diana Benea , Liviu Chioncel , Hubert Ebert , Doc.Dr. Jan Minár , Dieter Vollhardt , Christoph Hugenschmidt
Abstrakt EN: 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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