Univ Modena Ist Nazl Fis Mat Via Campi 213-a I-41100 Modena Italy
Univ Modena Dipartimento Fis I-41100 Modena Italy
Univ Zurich Inst Phys Ch-8057 Zurich Switzerland
Univ Fribourg Inst Phys Ch-1700 Fribourg Switzerland
Max Planck Inst Festkorperforsch D-70569 Stuttgart Germany

The role of on-site correlation in the low-energy excitations of nickel is studied by comparing the results of high-angular and high-energy resolution photoemission spectroscopy with quasiparticle states calculated as a three-body scattering solution of a multiorbital Hubbard model. It is found that correlation effects modify the energy dispersion and spin polarization of electron states and are essential in order to get a quantitative agreement with experimental data.
 

Physical Review B, 59 R10409 (Rapid comm.), 1999.