Photoemission Studies of Ferromagnetic and Paramagnetic Nickel

High-resolution photoemission spectra obtained from ferromagnetic nickel (295^∘{}K, 0.47TC) and paramagnetic nickel (678^∘{}K, 1.07TC) give no evidence of a change in the position of the d-electron peak near the high-energy cutoff of the photoelectron distribution within the experimental uncertainty of ±{}0.05 eV. On the other hand, a calculation of the spectra based on a band structure with an exchange splitting of 0.37 eV for ferromagnetic Ni and zero splitting for paramagnetic Ni predicted peak position changes of 0.1 to 0.2 eV.