Atomic correlations in itinerant ferromagnets: Quasi-particle bands of nickel

Abstract

We measure the band structure of nickel along various high-symmetry lines of\nthe bulk Brillouin zone with angle-resolved photoelectron spectroscopy. The\nGutzwiller theory for a nine-band Hubbard model whose tight-binding parameters\nare obtained from non-magnetic density-functional theory resolves most of the\nlong-standing discrepancies between experiment and theory on nickel. Thereby we\nsupport the view of itinerant ferromagnetism as induced by atomic correlations.\n